# What is the kinetic energy of a 5 kg ball that is traveling with a constant velocity a distance of 100 meters in 8 seconds ?

## Steps please, thank you ^_^

Oct 21, 2017

Answer: $390.625$ J

#### Explanation:

Note that $K E = \frac{1}{2} m {v}^{2}$, where $K E$ is kinetic energy, $m$ is mass, and $v$ is velocity

We are given:
$m = 5$ kg
$\Delta d = 100$ m
$\Delta t = 8$ sec

Since the ball travels at constant velocity, we can use the formula $v = \frac{\Delta d}{\Delta t}$:
$v = \frac{100}{8} = 12.5$ m/s

Plugging $m$ and $v$ into the formula for kinetic energy, we get:
$K E = \frac{1}{2} m {v}^{2} = \frac{1}{2} \left(5\right) {\left(12.5\right)}^{2} = 390.625$ Joules.