A boy throws a stone vertically down from a cliff top at aninitial velocity of 1

Question

A boy throws a stone vertically down from a cliff top at aninitial velocity of 15.0 m/s down. the cliff top is 85.0 mabove the ground. (a) what is the velocity of the stone as it is about to strikethe ground? (b) How long does ittake the stone to reach the ground? A boy throws a stone vertically down from a cliff top at aninitial velocity of 15.0 m/s down. the cliff top is 85.0 mabove the ground. (a) what is the velocity of the stone as it is about to strikethe ground? (b) How long does ittake the stone to reach the ground?

Explanation / Answer

(a)    we use the equation of motion    v2 - u2 = 2 a s    v2 - (15.0 m / s)2 =2 (9.80 m / s2) (85.0 m) (b)    in this case we use the equation ofmotion    s = u t + (1 / 2) a t2    (85.0 m) = (15.0 m / s) (t) + (1 /2) (9.80 m / s2) t2    t = ......... s    t = ......... s

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