A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct?
Correct answer: D. By the principle of conservation of energy, the total energy of the ball is constant throughout its motion
- A. The kinetic energy of the ball is greatest at the greatest height attained
- B. The potential energy of the ball increase uniformly with time during the ascent.
- C. By the principle of conservation of momentum, the momentum of the ball is constant throughout its motion
- D. By the principle of conservation of energy, the total energy of the ball is constant throughout its motion
Explanation
By principle of conservation of energy, total energy remains same through the motion as P.E converts to K.E and K.E converts to P.E.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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