A 500kg car which was initially at rest travelled with an acceleration of 5m/s², its kinetic energy after 4 seconds was

Jamb 1979

A 500kg car which was initially at rest travelled with an acceleration of 5m/s², its kinetic energy after 4 seconds was A. 10⁵J B. 2.5 x 10³J, C. 2 x 10³J D. 5 x 10³J E. 5 x 10⁵J 

ANSWER: Option A

EXPLANATION: 

KE = ½mv²

Since v = u + at

KE = ½m(u + at)²

Substitute the values in the equation above to find your answer.

Remember u = 0 as the car started from rest.

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