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Is acceleration equal to deceleration?

Question : If a ball is rolled up a ramp at initial velocity 12 m/s and decelerates at a rate of 2 m/s2, then does the ball run back down the ramp with an acceleration equal to the deceleration? The incline is 36 m long and it takes 6 seconds to reach the position where the final velocity is zero.

Answer : Since there is no mention of friction, one must assume that gravity is the only force involved that can cause the deceleration of the ball. Remember, there is one more force, but it only acts normal (perpendicular) to the inclined plane. So, yes, the acceleration downslope should equal the deceleration upslope. You must realize that 'deceleration' is only a word for "acceleration that slows down the speed". Any comment?

Your Conscience or your Job

Is it worth constantly violating your principles to keep your position? In every job, you are sure to encounter occasional situations which require you to make a difficult ethical judgement call. Fortunately for most workers in regular jobs, such moments are rare, and do not go to the heart of their careers. However, if you constantly have to choose between going against your conscience and keeping your job, and doing what is right and losing your livelihood, you must decide which is more important to you: your conscience or your salary. There’s nothing easy about it; it can be heartbreaking to give up a job that is highly desirable apart from the fact that it requires you to betray your principles.
Ethical concerns often fall under these categories : (1) It’s an industry issue (if you believe that certain products are harmful, should you ever work for a company that makes or markets them?) (2) It’s one particular company (the culture there is such that everyone from top to bottom cheats and lies to get by) (3) It’s just a few individuals (your supervisor is a dishonest, dishonourable person in an otherwise decent business).
If it’s the Industry – If your convictions about an industry are strong, you would probably never consider a position in it except in extreme necessity, when you will stay only long enough to stabilize your finances before moving to something that weighs less heavily on you. But if your existing company ties up with that industry to promote its products, it gets trickier for you. The final decision about whether to stay or leave, to accept the project as a temporary evil or refuse it and damage your career, is yours to make, because no one else feels and thinks with your heart and mind.
If it’s your company – Should you have a job you love, but the practices of your particular company offend you, it could be worth your while to move to another company within the same field, but with a culture more in tune with your character. You need not get nasty about your workplace when interviewing for a new job, because that souns slef-righteous. Simply say that you are seeking a workplace culture that truly resonates with your values and honesty and hard work, and offers challenges that will help you grow in positive ways.
If it’s your Boss – Should the problem be down to one boss who is why enough not to justify whistle-blowing, yet isn’t honest enough in his dealings with clients for your comfort, weight the situation. How often does this person give you dodgy orders? Have you developed a strategy for getting around instructions like “Just lie to that customer”? Does he look like he is moving on or is he digging in till retirement?
Culture or Ethics? – Nor everything that makes you feel uncomfortable is bad. If you are meek, hate being firm, and are uneasy about taking a hard line with others on the job, it’s probably good to stick with it and develop that side of your personality. However, if it’s a matter of lying, cheating, doing something illegal, or doing something which you consider improper, rethink the job. Continually going against your principles will eventually damage you. The decision is ultimately yours, because losing a means of making a living is a deeply personal matter which depends on myriad factors, and is never to be taken lightly.

By Adele Ong (Straits Time 3/5/2008)

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Beware Fare Evaders

Fare evaders will be fined from 1 JulyPosted : 02 May 2008 1356 hrs

SINGAPORE: From 1 July, bus and MRT train commuters caught for deliberately not paying or under-paying the correct fares will be fined $20. Any misuse of concession cards, like those for students or national servicemen, will face a penalty fee of $50. The objective of penalty fees is to deter evasion of fares on basic bus and train services, said Mr Gerard Ee, chairman of the Public Transport Council (PTC). Before the penalty fee regulations kick in on 1 July, the public transport operators - SBS Transit and SMRT - will embark on an awareness programme to inform commuters of the penalty fees.