SOLUTION: A body which is uniformly retarded to rest in 10sec after travelling a distance of 20m calculate the initial velocity

Question 1144062: A body which is uniformly retarded to rest in 10sec after travelling a distance of 20m calculate the initial velocity

Answer by ikleyn(52898) (Show Source): You can put this solution on YOUR website!
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A body uniformly decelerates to rest in 10 sec after travelling a distance of 20 m.
Calculate the initial velocity.
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Pay attention on how I edited your post and learn on how to use the words and the terms (the terminology) properly.

Solution

Let "a" be the deceleration value (now unknown) and let "t" be the duration of the decelerated move.


Then from Physics,  L = ,  where L is the distance to get stop.


In your case,  L = 20 m, t = 10 seconds,  so


    a =  =  =  = 0.4 .


Then for initial velocity v,  v = at = 0.4*10 = 4 .    ANSWER

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