Chapter SH, Problem 4.9APP

To determine

To calculate: Kinetic energy of an object.

Answer to Problem 4.9APP

Kinetic energy of the object is $\underset{\_}{122.5\text{ J}}$ .

Explanation of Solution

Given:

Mass = $5\text{ kg}$

Velocity = $7.0\text{ m/s}$

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:

  $\begin{array}{l}KE=\frac{1}{2}m{v}^2\\ KE=\frac{1}{2}\left(5\text{ kg}\right){\left(7\text{ m/s}\right)}^2\\ KE=\frac{1}{2}\left(5\text{ kg}\right)\left({\text{49 m}}^2{\text{/s}}^2\right)\\ KE=122.5\text{ J}\end{array}$

Conclusion:

Kinetic energy of the object is $\underset{\_}{122.5\text{ J}}$ .