Calculating Kinetic and Potential Energy

Question 1

A 60-kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational
potential energy does the person have at the top of the building?

Answer 1

43,982.4 J

Question 2

A person walks from the ground to the roof of a 74.8 m tall building, gaining 40,317.2 J of gravitational potential energy. What is the mass of the person?

Answer 2

55 kg

Question 3

A 60-kg person gains 24,696 J of gravitational potential energy by walking from the ground to the roof of a building. How tall is the building?

Answer 3

42 m

Question 4

A 588 N person walks from the ground to the roof of a 25 m tall building. How much gravitational
potential energy does the person have at the top of the building?

Answer 4

14,700 J

Question 5

A 400 N person gains 24,696 J of gravitational potential energy by walking from the ground to the roof of a building. How tall is the building?

Answer 5

61.74 m

Question 6

A person walks from the ground to the roof of a 74.8 m tall building, gaining 40,317.2 J of gravitational potential energy. How much does the person weigh?

Answer 6

539 N

Question 7

A 1400-kg car is moving at a velocity of 25 m/s. How much kinetic energy does the car have?

Answer 7

437,500 J

Question 8

A car is moving at a velocity of 25 m/s and has 781,250J of kinetic energy. What is the mass of the car?

Answer 8

2,500 kg

Question 9

A 1500-kg car is moving with 1,518,750 J of kinetic energy. What is the car’s velocity?

Answer 9

45 m/s