a A container with a mass of 5 kg is lifted to a height of 8

a) A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the gravitational force?

b) A container with a mass of 5 kg is lifted to a height of 8 m. How much work is done by the external force?

c) A container with a mass of 5 kg is lifted to a height of 8 m and then returned back to the ground level. How much work is done by the gravitational force?

Solution

PART A) W = F * d cos 180 = 5 kg * 10 m/s^2 * 8.00 m = -400 Joule =======PART A)

PART B) W = F * d cos 180 = 5 kg * 10 m/s^2 * 8.00 m = 400 Joule =======PART B)

PART C) W = 0.00 Joule =======PART C)