please solve and explain

2 5 1 6 8 9 10 11 1) In moving an object of mass 10 kg through a distance of 8.0 m, 40 J of work is done. The average force exerted is: 2) What is the kinetic energy of a 20 kg object moving at a speed of 10 m/s?? 3) The gravitational potential energy of a bird of mass 2.0 kg on a tree branch of height 15 m is most nearly 4) Two objects have the same mass. One is travelling twice as fast as the other. The work that must be done to stop the faster object compared to the work required to stop the slower object is: 5) When a rock is thrown straight up in the air, after it leaves the hand, the rock begins to slow down. This occurs because. 6) A 1000 kg car whose speed is 80 km/h has a kinetic energy of:|