Answer: The gravitational
Explanation: The student is pushing the box so u have to have gravitational force so it could move
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When light changes speed, it REFRACTS.
Your answer is going to be option C.
Hope this helps you.
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The car at 60 kph has 9 times more kinetic energy than the car traveling at 20 kph. This assumes that both cars have the same mass. Kinetic energy depends on the square of thee speed so if one car is going 3 times faster, its kinetic energy will be 3^2 ( = 9 ) greater. The car going at 60 kph will have 4 times the KE of the car going at 30 kph ( again assuming that the cars have the same mass.)
