Question

A 26.9 g rock rolls down the Hill at a speed of 81.9 m/s. what is the kinetic energy of the rock?

Answer 1

90.21 J

Step-by-step explanation:

Given that,

Mass of a rock, m = 26.9 g = 0.0269 kg

Speed of the rock, v = 81.9 m/s

We need to find the kinetic energy of the rock. It can be calculated using the formula as follows :

`E=(1)/(2)mv^2\\\\E=(1)/(2)* 0.0269* 81.9^2\\\\E=90.21\ J`

So, the kinetic energy of the rock is 90.21 J.