Question

A 45.0 kg skater is skating down a hill on roller blades at a speed of 10.0 m/s. What is the kinetic energy of the skater?

Answer 1

The skater has a kinetic energy of `2.25xx10^(3) J.`

Explanation:

To find the kinetic energy, we must use this formula:

The mass and velocity have good units, so all we have to do is plug the given values into the equation and solve for KE like this:

`KE =(1/2)(45.0kg)(10.0m/s)^(2)`
`KE = 2.25xx10^(3) kgxxm^(2)/s^(2)`
`KE = 2.25xx10^(3) J`