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A ball is thrown from a roof top at an angle of 45° above the horizontal. It hits the ground a few seconds later. At what point during its motion, does the ball have 

(a) greatest speed

(b) smallest speed

(c) greatest acceleration.

Explain.

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(a) It has greatest speed just before it hits the ground.

(b) It has smallest speed at the highest point reached.

(c) Acceleration is always constant throughout the journey and is vertically downward equal to g.

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