In a test of safety restraint, a test car was slowed from 50 m s-1 to rest in a time of 0.40 s. (a) what acceleration was this? (b)how far did the car travel in this time? (Wikipedia)
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acceleration=velocity/time
=50/0.4
=500/4
=125ms-².
50 = 2×125×t
t = 50/250
= 0.2 s.
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