Question

A cricket ball of a mass 0.2 kilograms moving with a velocity 20 meter/second is brought to rest by a player in 0.1 second find the impulse to the ball?
​

Answer 1

$\bf\huge\underline{\underline{ Given :- }}$

• mass of cricket ball = 0.2 kg

• initial velocity = 20 m/s

• final velocity = 0 m/s

• time = 0.1 s

$\bf\huge\underline{\underline{ To \: Find:- }}$

• impulse provided to the ball

$\bf\huge\underline{\underline{ Answer :- }}$

According to Newtons second law ,

Impulse = Change in Momentum

• momentum = mass × velocity

• mass = 0.2 kg

• initial velocity = 20 m/s

• final velocity = 0 m/s

• time = 0.1 s

$\rule{10cm}{0.05cm}$

• initial momentum = 0.2 × 20 = 4 kgm/s

• final momentum = 0 × 20 = 0

• change in momentum = final - initial

• change in momentum = 4 - 0

• change in momentum = 4 kgm/s

$\rule{10cm}{0.05cm}$

• Change in momentum = 4kgm/s

• change in momentum = impulse

• Impulse = 4 Ns