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

Question 3 Exercise 3C

A body of mass m moving with a velocity v is acted upon by a force. Write an expression for the change in momentum in each of the following cases:

(i) when v << c, (ii) when v → c, and (iii) when v<< c but m does not remain constant. Here c is the speed of light.


Let Δp is the change in momentum;

(i) When v << c ;

Δp = m Δv

(ii) when v → c;

Δp = Δ(mv)

(iii) when v<<c;

Δp = Δ(mv)

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