Which has greater kinetic energy, a car traveling at 30 km/h or a car of half that mass traveling at 60 km/h?

Question

Quizplus · Accepted Answer

The kinetic energy (KE) is given by the formula KE = 1/2 m v^2, where m is the mass and v is the velocity. When the velocity is doubled (from 30 km/h to 60 km/h), the kinetic energy increases by a factor of 4 (since 2^2 = 4), even though the mass is halved. Therefore, the car traveling at 60 km/h has greater kinetic energy.

Which Has Greater Kinetic Energy, a Car Traveling at 30