If the kinetic energy of a 0.62kg stone is 2.3J at its highest point and 9.4J at its lowest point how do I calculate the height at the highest point.

Question

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The difference in KEnergy has to be equal to the change in gravitational PE.

mgh = 9.4-2.3
0.62*9.8*h= 7.1
solve for h in meters.