Question

Two objects were lifted by a machine. one object had a mass of 2 kilograms, and was lifted at a speed of 2m/sec. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. which object had more kinetic energy while it was being lifted ?

Answer 1

KE = half of mass times squared speed


KE1 = 0.5 * 2 kg * (2 m/s)^2 = 4 J
KE2 = 0.5 * 4 kg * (3 m/s)^2 = 18 J
Second had more.