Q24 of 124 Page 55

A body of mass 25 kg has a momentum of 125 kg. m/s. Calculate the velocity of the body.

Given: mass of the body, m =25 kg

Let the velocity of the body be v m/s

Momentum of the body, p =125 kg. M/s

Now, p = mv

125 = 25(v)

v = 5 m/s

Hence, the velocity of the body is 5 m/s

Calculate the momentum of a toy car of mass 200 g moving with a speed of 5 m/s.

What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?

Calculate the momentum of the following:

(a) an elephant of mass 2000 kg moving at 5 m/s

(b) a bullet of mass 0.02 kg moving at 400 m/s

Which of the two, balanced forces or unbalanced forces, can change the shape of an object? Give an example to illustrate your answer.