Question

A body is initially at rest on a smooth surface. A force $F$, whose time variation is shown in the adjacent figure acts on it for a duration of $4s$. The momentum of the ball at the end of the $4s$ is in $N-s$

• A. $10$
• B. $20$
• C. $30$
• D. $40$

Answer 1

The correct option is D $40$

Momentum $=$ Area under the graph $=\frac{1}{2}\times 4\times 20=40Ns$