Homework Help: physics

Posted by Steve smith on Sunday, October 24, 2010 at 7:32pm.

A boy standing on top of a hill throws a stone horizontally. The stone hits the ground at the foot of the hill 2.5 s later. How high is the hill ?

physics - MathMate, Sunday, October 24, 2010 at 9:13pm
The rock was thrown horizontally, so u, the initial vertical velocity = 0
Use equations of motion:
u = initial vertical velocity = 0
S = vertical distance travelled, m
t = time, s
g = acceleration due to gravity, 9.81 m/s²

S = ut + (1/2)at²
Solve for S.

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