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A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?

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ma364054

Gravitational potential energy=massgravitational accelerationheight
Kinetic energy = 0.5massvelocity²
 So with the given data
K.E 0.51x²=12.5 v²=12.5÷(0.51)
v=√12.5÷(0.51) v=5  
GPE massgravitational accelerationheight
19.81h=98
h=98÷(9.81*1)
h= 9.98 m

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