A ball is thrown from a roof top at an angle of $45^o$ 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.
A ball is thrown from a roof top at an angle of $45^o$ 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.
Consider the given figure in which a ball is projected from point 0 and goes to c through $\mathrm{A}$ and $\mathrm{B}$.
Ground
$(a)$ At point B, it will gain the same speed $v_{0}$ and after that speed increases and will be maximum just before reaching at$ C$.
$(b)$ During upward journey from $0$ to $A$ speed decreases and will be minimum at point A.
$(c)$ Acceleration is always constant and is equal to $g$.
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- [AIIMS 2011]
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