Answer:
Q:
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?
A:
Kinetic energy = (1/2) (mass) (speed²)
First object: (1/2) (2 kg) (2 m/s)² = 4 joules .
Second object: (1/2) (4 kg) (3 m/s)² = 18 joules .
The second object had more kinetic energy than the first one had.
Explanation: