1) An 93.2 kg box is pushed up a frictionless incline, resulting with the height of 5.4 m and length of the incline of 10.1 m . How much work, in kJ, is done on the box in moving it to the top? (Hint, think energy, not forces.)

2) A roller coaster starting at point A, the heights point, at a height of 35.9 m from the ground level, the moves to point B, the ground level and then goes up at point C at a height of 22.3 m and then slows down at point D that is 14.8 m from the ground level.Through the roller coaster there is no friction, but when it reaches point D there is a horizontal platform of length 16.3 m that has friction that causes the roller coaster to stop. How much acceleration from friction is required to stop the roller coaster along this length, assuming it has a speed of 1.72 m/s at point A?

3) A 71.3 kg diver steps off a 21.8 m tower and drops, from rest, straight down into the water. If he comes to rest 4.3 m beneath the surface, determine the average resistive force exerted on him by the water, in kN.

4) Water flows over a section of a waterfall at the rate of 6.22 x 10⁶kg in 3.35 s and falls 77.0 m. How much power, in MW, is generated by the falling water?

5) A 6.57 x 10²N force, acting at 24.4^oabove the surface, is pulling on an 82.0 kg refrigerator across a horizontal floor. The frictional force opposing the motion is 1.82 x 10²N and the refrigerator is moved a distance of 1.69 m. Find the work net done, in kJ.