# physics

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A stone is thrown vertically upward with a speed of 10.0 m/s from the edge of a cliff 59.0 m high.
How much later does it reach the bottom of the cliff?
What is its speed just before hitting?
What total distance did it travel?

• physics -

vertical position:

hf=hi+Vi*t-1/2 g t^2
you know hf=-59
hi=0 solve for t, notice it is a quadratic.

Finalspeed=Vi -g*t
Vi=10m/s

total distance=59+2*heightaboveclift

Not to figure the height above. At the top, Vf=0 (think about that).
Vf=Vi-gt solve for t at the top.
h=Vi*t-1/2 g t^2 solve for h, heightabove clift.

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