science

posted by lekshmi

a stone is thrown vertically upward,went up 98m and came down.How long was it in air?

  1. bobpursley

    I suspect it was twice as long as it took to fall 98m.

    time to fall 98m
    98=1/2 g t^2
    t= sqrt(2*98/9.8)
    so double that, and you have it.

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