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March 25, 2017

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A tennis ball is thrown vertically upward with
an initial velocity of +7.5 m/s.
What will the ball’s velocity be when it
returns to its starting point? The acceleration
of gravity is 9.81 m/s
2
.
Answer in units of m/s


How long will the ball take to reach its starting
point?
Answer in units of s

  • physics - ,

    Vfinal = Vinitial
    (Consider conservation of energy)

    Time (up and down)
    = 2*Vinitial/g
    = 2*7.5/9.8 = ___ s

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