A bus moving along a straight highway with speed of 72 km / h is brought to halt within 4 s after applying the brakes. The distance travelled by the bus during this time (Assume the retardation is uni

Question

A bus moving along a straight highway with speed of 72 km / h is brought to halt within 4 s after applying the brakes. The distance travelled by the bus during this time (Assume the retardation is uniform) is _____m.

TestHub · Accepted Answer

​ Initial velocity = u = 72 km / h = 20 m / s v = u + at ⇒ 0 = 20 + a × 4 a = − 5 m / s 2 v 2 − u 2 = 2 as ⇒ 0 2 − 2 0 2 = 2 ( − 5 ) . s s = 40 m ​

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