Chapter SH, Problem 4.11APP

To determine

To calculate: Kinetic energy from the ball’s motion.

Answer to Problem 4.11APP

Kinetic energy from the ball’s motion is $\underset{\_}{\text{80 J}}$ .

Explanation of Solution

Given:

Mass = $0.4\text{ kg}$

Velocity = $\text{20 m/s}$

Formula used:

Kinetic energy is given by,

  $KE=\frac{1}{2}m{v}^2$

where m is mass and v is velocity.

Calculation:

Kinetic energy is calculated as:

  $\begin{array}{l}KE=\frac{1}{2}m{v}^2\\ KE=\frac{1}{2}\left(\text{0}\text{.4 kg}\right){\left(\text{20 m/s}\right)}^2\\ KE=\frac{1}{2}\left(\text{0}\text{.4 kg}\right)\left({\text{400 m}}^2{\text{/s}}^2\right)\\ KE=80\text{ J}\end{array}$

Conclusion:

Kinetic energy from the ball’s motion is $\underset{\_}{\text{80 J}}$ .