Please solve these problems with a good explanation and make it clear please

PHYS 221 Sample questions chapter (8-11) U U} I; t] 1 . l.' Inn 0 I J 3 4 a. The object starts from rest at x = 0 111. What is its speed at X: 3 m? b. Draw a force-versus-position graph showing the force Fx acting on the object as it moves from x = 0 m to x = 4 m. Include an appropriate numerical scale on the force axis. -r' III'IlI l 2 i 4 c. Use the work-kinetic energy theorem to nd the object's speed at x = 3 In if it starts from rest at 0 In. 15. a. How much work does an elevator motor do to lift a 1000 kg elevator a height of 100 m? b. How much power must the motor supply to do this in 50 s at constant speed? 16. a. A 50 g ice cube can slide without friction up and down a 30 slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10 c. the spring constant is 25 me. When the ice cube is released, what total distance will it travel up the slope before reversing direction? (ans 0.51 m) b. The ice cube is replaced by 50 g plastic cube whose coefcient of kinetic friction is 0.20. How far will the plastic cube travel up the slope? Use work and energy. (ans 0.38 m)