Answer:
7500 J
-2475 J
0 J
Step-by-step explanation:
Kinetic energy, KE is given by
where m is the mass of an object and v is the velocity.
Change in kinetic energy is calculated by

First case
We compare 50 kg travelling at 10 m/s to 50 kg at 20 m/s

Second case
We compare 50 kg travelling at 10 m/s to 50 kg at 5 m/s

Third case
We compare 50 kg travelling at 10 m/s to 50 kg at 10 m/s
