Express Train
Express Train
A question asks me to express a train's velocity at the time it puts on the brake. See details?
A question asks me to express a train's velocity at the time it puts on the brake. It says that when it puts on the brake, the time is zero. Why is the time zero?
Please explain to me in the understandable English language instead of babbling on using pro math terms. Thanks! 
The time is just a reference point, You Can use time 0 when the train started moving or even if it stopped, it does not matter, the change in time will always be the same, say the train stops after 5 seconds, time interval is 5, whereas if the brakes were on at time 5, the train would stop at time 10, the time interval is still 5, so it does not really matter what you start the time as..
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ALFRED WERTHEIMER ELVIS PRESLEY TRAIN PHOTOGRAPH SIGNED | |
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US $39.99 | 27d 10h 4m |
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US $775.00 | 27d 9h 41m |
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