Plz i dont want to fail my test. a stone is dropped from a height of 7.70m. how fast is it going when it is 5.25m above the ground? use energy to solve.

The energy associated with the stone from a height of 7.70 m can be calculated by multiplying the mass, gravitational acceleration and height. We do as follows:

Energy = mgh
Energy at 7.70 m = m(9.81)(7.70) = 75.537m

Energy at 5.25 m = 0.5mv^2 =75.537m
v = 12.29 m/s

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