Homework Help: Physics

Posted by Allison on Tuesday, October 30, 2012 at 6:00pm.

A boy wishes to throw a rock into the river below the cliff where he is standing. The cliff is 50 M high and he can throw with a horizontal velocity of 30 m/s. how long does it take for the rock to reach the water? How far, in the horizontal direction, does the rock land?

Physics - Lala, Tuesday, October 30, 2012 at 6:55pm
You are looking for range. Range = Vh x t
Vh = 30 m/s
t= ?
We know d= 50 m, viv = 0 m/s a=9.8
d=vit + 1/2 at ^2
50=0 + 1/2 9.8 t ^2
50 = 4.9 t^2
t = 3.1 s

Range = (30) (3.1)
= 95.8 m
Hope this helped !

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