The frictional force exerted by the floor is equal in magnitude to F and acts in the direction opposite to motion. Net force is zero because the table moves with a constant velocity.
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The impact velocity is 14.14 m s-1, derived from square root of two g h. Total kinetic energy equals 150 J, which divided by 3000 N resistive force gives a sand depression depth of 0.05 m.
Reading Fig. 7.39, total energy is 30 J. At P, potential energy is 20 J giving velocity 6.32 m s-1. At Q, potential energy is 30 J giving velocity 0 m s-1. Point R cannot be reached since it requires ...
From Fig. 7.38, the car maintains a steady speed of 35 m s-1 between A and B. Kinetic energy at A is 612500 J. Braking from B to C performs minus 612500 J of work, generating heat and sound.
The maximum height reached is inversely proportional to acceleration due to gravity. Since the Moon has one-sixth of Earth gravity, the ball travels six times higher, reaching a height of 48 m on the Moon.