A boy throws a ball vertically up. It returns to the ground after 5 seconds. Find (a) the maximum height reached by the ball.

Question

A boy throws a ball vertically up. It returns to the
ground after 5 seconds. Find
(a) the maximum height reached by the ball.
(b) the velocity with which the ball is thrown up.

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Kim Chi 3 years 2021-09-02T19:45:44+00:00 1 Answers 58 views 0

Answers ( )

  1. thuthao
    0
    2021-09-02T19:47:07+00:00
    Reply

    Answer:

    31.25 m

    25m/sec

    Explanation:

    Given :-

    Time = 5sec

    V = 0 (in going up)

    U = 0 (in comming down)

    Find :-

    H and U by which it is thrown up

    Since the total time is 5 sec ,therefore half time will be taken to go up and another half will be taken to go down .

    We know that ,

    V = U + gt

    0 = U – 10*2.5

    U = 25 m/sec

    Also,

    V² = U² +2gs

    0 = 625 – 20s

    s = 625/20 = 31.25 m

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