To assist with a class demonstration, a student (whose mass is 60 kg) filled a water balloon with 2 kg of water. He then climbed to the second floor (10 metres) of the school and held the balloon out of a window. How much work did the student do?

W = 6082.2 [J]

Explanation:

To solve such problems we must use the definition of work. Which tells us that work is equal to the product of force by a distance.

The force will be equal to the product of the mass combined by the gravitational force.

F = m * g

where:

m = combined mass = 60 + 2 = 62 [kg]

g = gravity = 9.81 [m/s^2]

F = 62 * 9.81 = 608.22 [N]

And the work done.

W = F * d

W = 608.22 * 10

W = 6082.2 [J] units in Joules

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.

i think it would be 5