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19-02-2020
Physics

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A child pushes a toy car down a hill. After 5 seconds, the car has a kinetic energy of 115 J and a gravitational potential energy of 30 J. What is the car’s mechanical energy at that time?

A) 3.9 J
B) 85 J
C) 115 J
D) 145 J

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20-02-2020

Answer:

D) 145 J

Explanation:

Mechanical energy = kinetic energy + potential energy

ME = KE + PE

ME = 115 J + 30 J

ME = 145 J

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