Question

A ball of weight 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse is (Taking final velocity as positive)

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

Answer 1

Answer: (B)

$0.1 \times (40) - 0.1 \times ( - 30)$

Answer 2

Impulse = change in momentum

$m v _ { 2 } - m v _ { 1 }$= $0.1 \times 40 - 0.1 \times ( - 30 )$