# Q 16.     An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s-1 to 8 m s-1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

The momentum is given by :

Initial momentum is :

And the final momentum is :

Also, the force is defined as rate of change of momentum.

Thus

or

Hence the force exerted on the body is 50 N.

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