A car is moving at a constant velocity when it is involved in a collision. The c

Question

A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60 m/s ^2 in the direction opposite that of the cars velocity. What was the speed, in km/h , of the car before the collision? A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60 m/s ^2 in the direction opposite that of the cars velocity. What was the speed, in km/h , of the car before the collision?

Explanation / Answer

initial speed u= ?

final speed v= 0m/s

decelaration a = - 60 m/s2

time t = 0.45 s

from the equation v = u + at

           u = at = 60 * 0.45 = 27 m/s

initial velocity u = 27 m/s

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