- a ball of mass 2 kg and another ball of mass 4 kg are dropped together from a 60 feet tall building. after a fall of 30 feet each towards earth, thier respective kinetic energies will be in which ratio ??
- when the speed of a body is doubled, its kinetic energy increases by how much ?
1. Given that,
m1 = 2kg
m2 = 4kg
Both balls are under free fall so they attain same speed at same height from the earth.
KE = 0.5 mv2
Here, v is same. then
KE α m
2. KE α v2
If speed is doubled, then kinetic energy will be four times.