Question

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

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

Answer 1

Answer: (B)

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

It is known that :

Impulse = change in momentum

$J=\Delta P$

putting values:

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