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an object of mass 40 kg of raised to a height if 5 m above the ground . what its is p. e? if the object is allowed to fall find its k. e when its half way down
Answers
Answer:
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
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answer
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 Jn: