- #1
vincent142
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Homework Statement
use an imaginary scenario of a falling rock in a tall vacuum chamber. suppose the rock has a mass of 0.5 kg, and it falls from a height of 78.4, the falling time from the top to the bottom of the chamber is 4.0 sec. the kinetic energy of the rock is zero (Ek = 0) at the top of the chamber and the gravitational potential energy of the rock (Eg = 0) at the bottom of the chamber.
h = 78.4 cm
mass = 0.5kg
time= 4 sec
PROVE that Etotal = Eg + Ek during falling time. use 1.0 sec interval to calculate total energy of the rock at different height
Homework Equations
Ek = 1/2 mv^2
Eg = mgh
The Attempt at a Solution
i am not sure how to find velocity... because it changes when it falls down (Accelerates) :S