Gravity Playing with units
A mass of 10000000 milligram is released from a height of 4000 centimetre above the surface of the Earth .
Calculate its mechanical energy when it is at 2000 centimetre, above the surface of the Earth.
DETAILS AND ASSUMPTIONS:
1) Take the acceleration due to gravity as
2) Provide your answer in Joules.
The answer is 4000.
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1 solution
Applying conservation of energy, we have mechanical energy at height 4000 cm = mechanical energy at height 2000cm = gravitational potential energy = mgh = (10000000 * 10^ (-6) ) * (4000 * 10^(-2)) * (10) = 4000 (J)