Question

A ball is thrown vertically upwards from the ground. It crosses a point at the height 25m twice at an interval of 4sec. The ball was thrown with velocity of:-
a)20m/s
b) 25m/s
c) 30m/s
d) 35m/s

Answer 1

Hii

you are welcome in my ans

u = -g(4 - t)

25 = -10 ( 4 -t - t^2/2)

5/2 = -8 +t^2 +2t

2t^2 + 4t - 21 = 0

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Answer 2

Answer:

Explanation:

Here's the solution to your question.

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