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Posted by on Sunday, November 14, 2010 at 12:03pm.

A stone was thrown into the air and returned after 4.2 seconds.

a) At what speed was the stone thrown? (20.6) <- i got that right.

b) How high did the stone go? (21.6 m)

i don't know how to get b. what steps do i do?

  • Physics - Free Fall - , Sunday, November 14, 2010 at 2:31pm

    The stone with an initial velocity, v, has a kinetic energy of (1/2)mv².

    When at the top, velocity = 0, but the potential energy is mgh.

    So equate energies to get
    mgh = (1/2)mv²

    Solve for h.

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