. A man if 20 kg is dropped from a height of 5 m. Find its KE as it just reaches the
ground?
Answers
GiveN:
- Mass of the body = 20 kg
- Height from which it is dropped = 5 m
To FinD:
- KE of the body as it reaches the ground?
Step-by-Step Explanation:
According to law of conservation of energy, all the potential energy possessed by the body at certain height gets converted into kinetic energy when it reaches the ground. That means:
- Potential energy at a height of 5 m = Kinetic energy of the body as it reaches ground.
Finding PE at a height of 5 m
= mgh
= 20 × 9.8 × 5 J
= 100 × 9.8 J
= 980 J
We above just determined that KE at ground will be equal to the Potential energy possessed at a height of 5m.
Hence,
KE of the body when it reaches ground:
Answer:
A mass of 20 kg is dropped from a height of 5m.Find it's K. E as it's reaches the ground
- Mass of object = 20kg
- Height = 5m
- Find its KE as it just reaches the ground?
↪ when the body is released from a height of 5 meters then all the kinetic energy will be equal to potential energy.
So, K•E = mgh
(Acceleration due to gravity (g) = 9.8 m/s²)
Therefore,
KE of the body when it reaches ground is 980J