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physical science

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A tennis ball is thrown vertically upward wih an initial velocity of 8.0m/s.
A) What will its speed be wheen it returns to its tarting point?
B) How long will it take for it to reach its starting poing?

  • physical science - ,

    (A)Speed = 8m/s
    (B)u=8m/s
    v=0m/s
    a=g=9.8m/s2
    Use
    v=u-gt
    0=8-9.8t
    9.8t=8
    t=8/9.8
    But this is the time required by the tennis ball to reach the highest point.
    Time taken by the ball to return to the starting point=2t
    =2*8/9.8
    =8/4.9
    =1.632s

  • physical science - ,

    A volleyball is thrown vertically upward with an initial velocity of 7.5 m/s.
    A.What will its speed be when it return to ita starting point?
    B.How long will it take for it to reach its maximum height?

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