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October 19, 2019

Solution to problems – class 9 – Set 1 Q 22


Problem Statement

If a rocket-powered sled is accelerated to a speed of 400 m/s in 2 seconds, then what is the acceleration and what is the distance that the sled travels?

Solution

Acceleration a = (v-u)/t = (400 – 0)/2 = 200 m/s2


Distance travelled by the sled S = ut + ½ a t2

As u = 0, the equation becomes    S = ½ a t2

S = ½ .200. 22 = 400 m

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