Given
Mass of the object = 40kg
Height = 5m
Find out
We need to find Potential energy and also its kinetic energy when it is half-way down
Solution
Potential energy (K.E) is given by the expression,
K.E = m × g × h
Where,
- m = Mass of the object
- h = Vertical displacement
- g = Acceleration due to gravity (9.8 ms-2)
P.E = 40 × 9.8 × 5
P.E = 1960 J
At half-way down, the Kinetic energy of the item:
At this time, the item has an equal quantity of potential and K.E.
This can be due to law of conservation of energy. Hence, half-way down, the K.E. of the object can be calculated as
1960 J/ 2
⇒ 980 J
half way down = 980 J
