Two balls A and B of masses’ and ‘2m’ are in motion with velocities 2V and V respectively.Compare(I)their inertia(2)their momentum(3)the force needed to stop them in same time

(ii) Momentum is p = mv

Thus, for A, p_{A} = m�2V = 2mV

And, for B, p_{B} = 2m�V = 2mV

Thus, momentum for both is same.

(iii) According to Newton’s second law, force is rate of change of momentum.

Since, we have to stop both the masses, their final momenta is zero.

Thus, force for both masses to stop in same time will be same.

F = dp/dt = 2mV/dt