A rock falls off a bridge and hits the water 8 seconds later. How high is the bridge?

1 Answer
Burglar
Jun 29, 2016

It is #313.92# m.

Explanation:

The dynamics of a free fall body is regulated by the constant acceleration motion.
The equation of motion says that

#s=1/2gt^2#

where #s# is the space traveled, #g=9.81 "m"/"s"^2# is the acceleration of gravity and #t# is the time.
Then the space traveled is

#s=1/2*9.81 "m"/"s"^2*8^2"s"^2#

#=32*9.81 "m"=313.92 "m"#.

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