Question

What is the change in momentum produced by a 25 N force acting on a body of mass 20 kg for 2 s if the body is moving with an initial velocity of 10 m/s? 5 kg m/s 500 kg m/s 50 kg m/s 0.5 kg m/s​

Answer 1

Answer:

F= dp/dt= change in momentum/ time period

dp= F.dt= 25*2= 50 kg m/s

Explanation:

Here, one might assume change in momentum is mass*velocity which in this case will be 200 kg m/s.

However, please keep in mind that change in momentum means [mass( final velocity- initial velocity)]. Only the initial velocity is provided here, therefore, 200 kg m/s is the initial momentum and not the change in momentum.

In physics it is always helpful to check all the data and consider all possible formulae related to the given data.

Hope this helps.