A rock is thrown vertically upward with an initial speed v0. Assume a friction f
ID: 1482967 • Letter: A
Question
A rock is thrown vertically upward with an initial speed v0. Assume a friction force proportional to v, where v is the velocity of the rock, and neglect the buoyant force of the air. Which of the following is correct? a The magnitude of the acceleration of the rock is always less than g. b The magnitude of the acceleration of the rock is always equal to g. c The magnitude of the acceleration of the rock is only equal to g at the top of the flight. d The rock can attain a speed greater than v0 before it returns to its starting point. e The speed of the rock upon its return to its starting point is v0.
Explanation / Answer
c) The magnitude of the acceleration of the rock is only equal to g at the top of the flight.
it is greater than g during the upward flight and is less than g during landing.
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