6.a motor pulls an 800 kg roller coaster train to the top of a 75 m hill. what is the change in the potential energy of the cars? a.5.9 x 10 ⁵ j b.6.0 x 10 ⁴ j c.18 x 10 ⁴ j d.7.5 x 10 ⁵ j 7.friction converts kinetic energy to which form? a. potential energy b. mechanical energy c. non mechanical energy d. total energy 8.how much power does a crane need to lift a 200.0 kg mass at a speed of 2.300 m/s? a. 460w b. 1962w c. 4513w d. 6123w 9.if a 50.0 kg cheetah, initially at rest, runs 274 m north in 8.65 s, what is its momentum? a.31.7 kg m/s b.1584 kg m/s c.490.5 kg m/s d.118,500 kg m/s 10.what is the kinetic energy of a 0.005 kg raindrop that falls 250 m? a.4.9j b.1.25j c.8.3j d.5.6j