Question

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

• A. $2.5Ns$
• B. $2.0Ns$
• C. $1.5Ns$
• D. $0.5Ns$

Answer 1

Answer: (A)

$2.5Ns$

Given that the mass of the body is $0.25kg$ is at rest initially. when the body is hit by the stick it gains speed of $10m/s$.

means initial speed $u=0$ and after getting hit it's final speed $v=10m/s$.

we know that impulse is equal to change in momentum i.e. $\text{Impulse}J=m(v-u)$

so here $J=0.25(10-0)$ $kgm/s$ or $N$

hence The impulse imparted to the ball is $2.5Ns$