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A ball is released from rest near the surface of the Moon. Which one of the following quantities increases at a constant rate?
A. Only distance fallen
B. Only speed
C. Only speed and distance fallen
D. Only speed and acceleration
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(1)
The stone leaves Christina’s hand (point O) at a speed of 15 m s−1 in the direction shown. Her hand is at a height of 25 m above sea level. The mass of the stone is 160 g. The acceleration due to gravity g = 10 m s−2.
(b) (i) Calculate the kinetic energy of the stone immediately after it leaves Christina’s hand.
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(1)
(ii) State the value of the kinetic energy at point Q.
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(1)
(iii) Calculate the loss in potential energy of the stone in falling from point Q to hitting the sea.
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(1)
(iv) Determine the speed with which the stone hits the sea.
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(2)
(Total 7 marks)
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what is SI unit of momentum? |
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what is SI unit of momentum? |
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