Physics

Two students are on a balcony a distance h above the S street. One student throws a ball vertically downward at a speed vi ; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of vi, g, h, and t. (a) What is the time interval between when the first ball strikes the ground and the second ball strikes the ground? (b) Find the velocity of each ball as it strikes the ground. (c) How far apart are the balls at a time t after they are thrown and before they strike
ground?

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  1. Any answers??? Any help???

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  2. Someone please help

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  3. Solving these without numbers is an godly mess. Who assigned this??

    a)the two times are solved via quadratics:
    0 = 1/2 g t^2 + vi t - h and
    0 = 1/2 g t^2 - vi t - h

    So t1 = [-vi + sqrt(vi^2 - 4(1/2 g)(-h)]/2(1/2g)

    which is ridiculous to work with

    b) the velocities will be the same:
    vf = vi + at
    c) x = 1/2 (vf + vi) t

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