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1. A subway train starts from rest at a station and accelerates at a rate of 2.50...

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Physics

1.A subway train starts from rest at a station and accelerates at arate of 2.50 m/s ^ 2 for 15.90 seconds. It then runs at a constantspeed for 35 seconds and then slows down at a rate of 4.50 m/s ^ 2until it stops at the next station .

(a) What is the speed of the train just before it startsslowing down ? (Ans .: v=39.75 m/s)

(b) How long did it take the train to finish the trip from onestation to the other ? (Ans .: t=59.73 s)

Answer & Explanation Solved by verified expert
3.7 Ratings (350 Votes)
1aLet us consider the motion of the train for the first 1590secondsWe haveInitial velocity because it starts from restAcceleration Time We have the equation of motion for the final velocity given    See Answer
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