Questions 27–29 refer to a coin which is tossed straight up into the air. After

Question

Questions 27–29 refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the acceleration of the coin during each of the stages of the coin's motion described below. Take up to be the positive direction. Answer choice J if you think that none are correct.

27. The coin is moving upward after it is released.

A.     The acceleration is in the negative direction and constant. B.     The acceleration is in the negative direction and increasing. C.     The acceleration is in the negative direction and decreasing. D.     The acceleration is zero. E.     The acceleration is in the positive direction and constant. F.     The acceleration is in the positive direction and increasing. G.     The acceleration is in the positive direction and decreasing.

Explanation / Answer

When the coin is in the air, only one force acts on it. This is the garvitational force. The acceleration due to this force is the gravitational acceleration 'g'.

The magnitude of 'g' is always constant and equal to 9.81 m/s2, and its direction is always towards the downward direction.

As per the assumption given, we have to take the downward acceleration as negative.

Hence the option (A), 'The acceleration is in negative direction and constant' is the correct option.

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