Question 1: A force acting on an object varies with distance ‘d’ as shown. Calculate the work done by the force as the object is displaced from d=0 to d=6m

Question 2: A 70 kg man runs up a long flight of stairs in 4 s. The vertical height of the stair is 4.5m. Calculate his power.

Question 3: A body of mass 2.0 kg is dropped from a rest position 5m above the ground. What is its velocity at height of 3.0 m above the ground?

Question 4: A man pulls a trolley through a distance of 50m by applying a force of 100N which makes an angle of 30° with horizontal. Calculate the work done by the man.

Question 5: A man whose mass is 70kg walks up to the third floor of a building which is 12m above the ground in 20s. Find his power in watts and hp.

Question 6: A ball of mass 100 g is thrown vertically upward at a speed of 25m/s. If no energy is lost, determine the height it would reach. If the ball only rises to 25m, calculate the work done against air resistance. Also calculate the force of friction.

Question 7: An object of mass 1000 g falls from a height of 30m on the sand below. If it penetrates 4cm into the sand, what opposing force is exerted on it by the sand? Neglect air friction.

Question 8: A body of mass ‘m’ drops from bridge into water of the river. The bridge is 10m high from the water surface.

(a). Find the speed of the body 5m above the water surface.

(b). Find the speed of the body before it strikes the water.

Question 9: The engine of JF-Thunder fighter (made by Pakistan and China) develops a thrust of 3000N. What horsepower does it at a velocity of 600m/s.