Question

A body of mass $25\text{g}$ has a momentum of $0.4\text{kg-m/s}$. Find its kinetic energy.

• A. $4.8\text{J}$
• B. $6.4\text{J}$
• C. $1.6\text{J}$
• D. $3.2\text{J}$

Answer 1

The correct option is D $3.2\text{J}$

We know that,

$KE=\frac{p^2}{2m}$

$\Rightarrow KE=\frac{{0.4}^2}{2\times 0.025}=3.2\text{J}$