Question

A stationary ball weighing 0.25 kg acquire a speed of $10m/s$ when hit by a hockey stick. The impulse imparted to the ball is:

• A. $0.25N\times s$
• B. $2.5N\times s$
• C. $2N\times s$
• D. $0.5N\times s$

Answer 1

The correct option is B $2.5N\times s$

Given : $m=0.25$ kg

Initial velocity of the ball $u=0$ m/s

Final velocity of the ball $v=10$ m/s

Impulse imparted $I=\Delta P=mv-mu=0.25\times 10-0=2.5$ $N\times s$