4.18. A ball is thrown from a rooftop at an angle of 45o 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?
Consider the adjacent diagram in which a ball is projected from point O, and covering the path OABC.
(a) At point B, it will gain the same speed u and after that speed increases and will be maximum just before reaching C.
(b) During the upward journey from O to A speed decreases and will be minimum at point A.
(c) Acceleration is always constant throughout the journey and is vertically downward equal to g.
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