Selina Solutions Class 9 Physics Solutions for Exercise 3C in Chapter 3 - Chapter 3 Laws Of Motion

Question 5 Exercise 3C

Two bodies A and B of the same mass are moving with velocities v and 2v respectively. Compare their (i) inertia (ii) momentum.


(i) If ‘m’ is the mass of two bodies A and B,

Comparing inertia of both the bodies;

The inertia of A: Inertia of B :: m:m or 1:1

(ii) To compare the momentum of bodies A and B

Momentum of A = m(v)

Momentum of B = m(2v) =2mv

Comparing the momentum of bodies A and B

The momentum of A: Momentum of B :: mv:2mv or 1:2

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