Kepler’s third law states that:

the squares of the orbital periods of the planets are directly proportional to the cubes of the semi major axes of their orbits.

Hope it helps :)

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

d. air pressure decreases as altitude increases.