Question

The kinetic energy of a body of mass $15kg$ is $30J$. What is its momentum? $(UseK.E=\frac{p^2}{2m}).$

Answer 1

Step 1: Given Data

Mass (m) $=15kg$

Kinetic Energy (K.E) $=30J$

Step 2: Formula used

$K.E=\frac{p^2}{2m}$

where p = momentum

Step 3: Calculating momentum

$$\begin{gathered} K.E=\frac{p^2}{2m} \\ {p}^2=K.Ex2m \\ {p}^2=30x2x15 \\ {p}^2=900 \\ p=\sqrt{900} \\ p=30kgm/s \end{gathered}$$

Hence, the momentum of the body is $30kgm/s.$