Class 9 Exam > Class 9 Questions > A ball is thrown upward from a point P, reach...
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A ball is thrown upward from a point P, reaches to the highest point Q :
- a)kinetic energy at P is equal to kinetic energy at Q
- b)potential energy at P is equal to kinetic enrgy at Q
- c)kinetic energy at P equal to potential energy at Q
- d)potential energy at P is equal to potential energy at Q
Correct answer is option 'C'. Can you explain this answer?
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A ball is thrown upward from a point P, reaches to the highest point Q...
Explanation:
When a ball is thrown upward from a point P, it gains potential energy due to its position in the Earth's gravitational field. As it rises to its highest point Q, its kinetic energy decreases due to the work done by the gravitational force. At point Q, the ball has zero kinetic energy and maximum potential energy.
At the highest point Q, the ball has no kinetic energy and all of its energy is in the form of potential energy. As the ball falls back down to point P, its potential energy is gradually converted back into kinetic energy. At point P, the ball has maximum kinetic energy and zero potential energy.
Therefore, we can conclude that:
- Kinetic energy at P is equal to potential energy at Q.
- This is because at point P, the ball has maximum kinetic energy and zero potential energy, while at point Q, the ball has maximum potential energy and zero kinetic energy.
- This relationship between kinetic and potential energy is known as the law of conservation of energy, which states that energy cannot be created or destroyed, only converted from one form to another.
In summary, the correct answer is option C: kinetic energy at P is equal to potential energy at Q.
When a ball is thrown upward from a point P, it gains potential energy due to its position in the Earth's gravitational field. As it rises to its highest point Q, its kinetic energy decreases due to the work done by the gravitational force. At point Q, the ball has zero kinetic energy and maximum potential energy.
At the highest point Q, the ball has no kinetic energy and all of its energy is in the form of potential energy. As the ball falls back down to point P, its potential energy is gradually converted back into kinetic energy. At point P, the ball has maximum kinetic energy and zero potential energy.
Therefore, we can conclude that:
- Kinetic energy at P is equal to potential energy at Q.
- This is because at point P, the ball has maximum kinetic energy and zero potential energy, while at point Q, the ball has maximum potential energy and zero kinetic energy.
- This relationship between kinetic and potential energy is known as the law of conservation of energy, which states that energy cannot be created or destroyed, only converted from one form to another.
In summary, the correct answer is option C: kinetic energy at P is equal to potential energy at Q.
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A ball is thrown upward from a point P, reaches to the highest point Q :a)kinetic energy at P is equal to kinetic energy at Qb)potential energy at P is equal to kinetic enrgy at Qc)kinetic energy at P equal to potential energy at Qd)potential energy at P is equal to potential energy at QCorrect answer is option 'C'. Can you explain this answer?
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