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a ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about:

a) 0.6 sec
b) 1.2 sec
c) 1.8 sec
d) 2.4 sec

Please explain how you find the answer!!! I cannot figure it out

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Jessica

  1. speed at the top is zero.

    Vf=vi-9.8t
    0=12-9.8t

    t= about ...

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    bobpursley

  2. I learned the formula to be v=gt...why are you subtracting?

    Also what is vf and vi?

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    Jessica

  4. vf= final velocity, which is zero at the top.
    vi is initial velocity.

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    bobpursley

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