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An object of mass 1.5 kg rests on a shelf where it has a gravitational potential energy of 7 joules. An object of mass 4.5 kg is placed on the same shelf. What is the gravitational potential energy of this second object?

• physic -

Isn't GPE directly proportional to mass?

So what if mass is tripled?

• physic -

PE = mgh
Therefore H = PE/(mxg)
H = 7/(1.5 x 9.8)
H = 0.48m
PE (object 2) = 4.5 x 9.8 x 0.48
PE (object 2) = 21.17J

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