Question

The figure shows the position-time (x-t) graph of one-dimenstional motion of a body of mass $0.4kg$. The magnitude of each impulse is

• A. $0.2Ns$
• B. $0.4Ns$
• C. $0.8Ns$
• D. $1.6Ns$

Answer 1

The correct option is C $0.8Ns$

$\text{impulse}=\Delta p=m\Delta v$

$u=\frac{2-0}{2-0}=1$

$v=\frac{2-4}{2-0}=-1$

$\Delta v=1-(-1)$$=2$

$\begin{array}{cc}\Delta p& =0.4\times 2\\ & =0.8NS\end{array}$