Question

11. A body moving with constant velocity is brought to rest in 0.25s by applying a retarding force of
100N. The initial momentum of the body is
[ ]
a) 25 kg m/s
b) 50 kg m/s
c) 100 kg m/s
d) 125 kg m/s
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Answer 1

Answer:

Let the initial momentum be p ,

So the change in momentum is also p as the motion comes to rest finally.

Now  p/0.25= 100N  

so p = 100*0.25

       = 25 kgm/s

Therefore, a) 25 kg m/s is the right answer.

Answer 2

Answer:

25 kg m/s

Explanation:

retardation of force = 100N

time= 0.25

change in momentum = force

DELTA(MV)/DELTA t

delta (mv) = (100) (0.25)

                = 25 kg m/s