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I fire a tennis ball from an air cannon, straight up from ground level, at initial speed v0. At
the instant it reaches the top of its trajectory, I fire a second tennis ball at the same initial
speed. Air resistance is negligible. At what fraction of the maximum height reached by the
first ball do the two collide?

  • Physics - ,

    start ball one at max height:
    hf=maxheight-1/2 g t^2
    ball two:

    but t is the same, and hf is the same:

    set the two equations equal, and solve for t.
    then having t, find hf.

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