Question 1 Foundation
Find the kinetic energy of a 1200 kg car travelling at .
Answer. kJ
J kJ.
Work, Energy and Power
Original questions written at exam standard. Work each one before you open the solution.
Difficulty
Question 2 Foundation
Find the potential energy gained when a 5 kg mass is raised 3 m. Take .
Answer. J
J.
Question 3 Standard
A 2 kg body speeds up from to . Find the work done by the resultant force.
Answer. J
J.
Question 4 Standard
A ball is dropped from 20 m. Find its landing speed using energy. Take .
Answer.
, so . The mass cancels.
Question 5 Standard
A car moves at a steady against a resistance of 600 N. Find the power developed.
Answer. kW
At constant velocity the driving force equals the resistance, so W kW.
Question 6 Stretch
A pump raises 200 kg of water through 12 m every minute. Find its power output. Take .
Answer. W
Work per minute J, so W.