Answer:
90.21 J
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 :
[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.0269\times 81.9^2\\\\E=90.21\ J[/tex]
So, the kinetic energy of the rock is 90.21 J.
