Question

A ball of weight $0.1$ kg coming with a speed $30$ m/s strikes a bat and returns in opposite direction with speed of $40$ m/s, then impulse is

• A. $-0.1\times 40-0.1\times 30Ns$
• B. $0.1\times 40-0.1\times (-30)Ns$
• C. $0.1\times 40+0.1\times (-30)Ns$
• D. $0.1\times 40-0.1\times 20Ns$

Answer 1

The correct option is B $0.1\times 40-0.1\times (-30)Ns$

Given,

$m=0.1kg$

$u=30m/s$

$v=-40m/s$

Impulse = change in momentum

$m{v}_2-m{v}_1=0.1\times 40-0.1\times (-30)$

The correct option is B