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The idea here is to assume that all the kinetic energy was originally (when the stone was at its highest point) gravitational potential energy. So, all you need to do is use the equation for gravitational potential energy, replace the numbers you know, and solve it for mass.

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6y ago
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6y ago

energy is 9.8 joules or 9.8 newton-meters. at 2 meters weight is 9.8/2 = 4.9 Newtons. Mass is weight/9.8 (weight/gravity acceleration) so m = 4.9/9.8 = 0.5 kilogram

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Q: Anne releases a stone from a height of 2 meters. She measures the kinetic energy of the stone at 9.8 joules at the exact point it hits the ground. What is the mass of the stone?
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