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Physics

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a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight?

  • Physics -

    a ball is thrown vertically upward from the ground with the velocity of 30m/s. a) how long will it take to rise to its highest poitn? b) how high does the ball rise? c) how long after projection will the ball have a velocity of 10m/s? d) what is the total time of flight?

    From Vf = Vo - gt, 0 = 30 - 9.8t yielding t = 3.06 sec.

    From h = Vo(t) - g(t^2)/2, h = 30(3.06) - 4.9(3.06)^2 yielding h = 45.88m.

    From Vn = Vo - gt, 20 - 9.8t yielding t = 2.04 sec.

    Since the fall time equals the rise time, the total flight time is 2(3.06) = 6.12 sec.

  • Physics -

    How do we handle something without a symetrical rise/fall time. An object thrown vertically from a window is the basis of this question

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