Physics circuit, need a walkthrough

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c