Question

two identical objects move with speeds of 5.0 m s and 25.0 m s. What is the ratio of their kinetic energies?

Answer 1

The formula for kinetic energy is KE = 0.5mv^2

Where m is the mass

And v is the velocity

Since the two object are identical so their mass are equal

KE1/ KE2 = 0.5m(v1)^2/ 0.5m(v2)^2

KE1/ KE2 = (v1)^2/ (v2)^2

KE1/ KE2 = (5)^2/ (25)^2

KE1/ KE2 = 1/25

KE1:KE2 = 1:25