Question

What is the velocity of a rock that is 20kg and has 36J of energy?

Answer 1

Given

Mass of the rock, m=20 kg

Energy is , K=36 J

To find

The velocity of the rock

Explanation

Let the velocity be v

The kinetic energy is given by

$\begin{gathered} K=\frac{1}{2}mv^2 \\ \Rightarrow36=\frac{1}{2}\times20\times v^2 \\ \Rightarrow v=1.86\text{ m/s} \end{gathered}$

Conclusion

The velocity is 1.86 m/s