Answer:
(a) When the ball
just reaches the ground.
(b) At highest
point, speed of ball = horizontal component of velocity \[=\upsilon \cos
{{45}^{o}}=\frac{u}{\sqrt{2}}\] and the vertical component is zero. Therefore,
ball has the smallest speed at the highest point.
(c) The ball moves
with constant acceleration through its journey and this constant acceleration =
g.
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