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Question
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
Figure
(a) its acceleration
(b) its kinetic energy
(c) its potential energy
(d) its weight
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Solution
When a stone is thrown vertically upwards, the following conclusions can be done for point P,
(a) The acceleration for the entire journey of the stone is constant, as acceleration due to gravity near the surface of the earth is constant.
(b) The velocity of the stone at P will be the least. Hence, kinetic energy at this point will be the least.
(c) The stone is at a maximum height at point P. Hence, the potential energy is the maximum at P.
(d) Weight of the stone will remain nearly constant, as acceleration due to gravity near the surface of the earth is constant.
Therefore, the answer is:
(c) Its potential energy.
(a) The acceleration for the entire journey of the stone is constant, as acceleration due to gravity near the surface of the earth is constant.
(b) The velocity of the stone at P will be the least. Hence, kinetic energy at this point will be the least.
(c) The stone is at a maximum height at point P. Hence, the potential energy is the maximum at P.
(d) Weight of the stone will remain nearly constant, as acceleration due to gravity near the surface of the earth is constant.
Therefore, the answer is:
(c) Its potential energy.
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