Question

What is the magnitude of kinetic energy of a 20kg box moving at a velocity of 8m/s

A. 160 J

B. 80 J

C. 640 J

D. 1280 J

Answer 1

Answer:

Explanation:

$KE=\frac{1}{2}mv^2$ and we are solving for KE:

$KE=\frac{1}{2}(20)(8)^2$ which gives us that

KE = 640 J, choice C.