Momentum, work, energy and power

Question 1 of 10

A ball of mass 0.5 kg hits a wall at 12 m/s and rebounds at 8 m/s. Find the impulse on the ball and the average force if the contact time is 0.02 s.

Question 2 of 10

Find the kinetic energy of a 3 kg body moving at 10 m/s.

Question 3 of 10

Gravitational potential energy is

Question 4 of 10

Power is

Question 5 of 10

A force of 40 N moves a body 6 m in the direction of the force. Find the work done.

Question 6 of 10

A 2 kg mass is raised through 7 m. Find the potential energy gained. (g = 10 m/s²)

Question 7 of 10

A 5 kg trolley moving at 8 m/s hits a stationary 2 kg trolley and they move on together. Find their common speed.

Question 8 of 10

A car of mass 1,000 kg moves up a slope inclined at 5° to the horizontal at a steady 15 m/s against a resistance of 500 N. Find the power of the engine. (sin 5° = 0.0872, g = 10 m/s²)

Question 9 of 10

Linear momentum is

Question 10 of 10

State the principle of conservation of energy and use it to find the speed of a body released from rest at a height of 20 m just before it hits the ground (g = 10 m/s²).