Question

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m per second

Answer 1

We have,v=u+at

or a=v-u/t

In this question the acceleration provided to the body=(0-4)/2=-2

De acceleration=2

The force which provided the de-acceleration,F=ma=2x2=4N

Now this force is to be opposed ,hence a force of 4N is required to keep the body moving with velocity of 4m/s.

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