Question

An object of mass 20 kg is dropped from a height of 4 m.

Question:2 )  Which of following sentence is correct according to above context.

A)    Total energy decrease as object reach towards ground.
B)    Kinetic energy decrease as object reach towards ground
C)    If we consider case of zero gravity then K.E. at every point is same as total energy
D)    Potential energy is only because of non conservative force







Tell me immediately
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Answer 1

The correct sentence is (C) " If we consider case of zero gravity then K.E. at every point is same as total energy".

• The total energy of a freely falling body remains constant.
• As the body falls from a height its potential energy keeps changing in the kinetic energy therefore the kinetic energy increases.
• If there is no gravity then potential energy which is m*g*h will be zero as g will be zero. Here m is the mass, g is the acceleration due to gravity and h is the height. The total energy of the body will be only its kinetic energy.