Hi i really need help with my physics activity. thank you

ENERGY 6. A rifle can shoot a 4.20-g bullet at a speed of 965 m/'s. a. Find the kinetic energy of the bullet. b. What work is done on the bullet if it starts from rest? c. If the work is done over a distance of 0.75 m, what is the average force on the bullet? 7. A shot putter heaves a 7.26-kg shot with final velocity of 7.50 m's. a. What is the kinetic energy of the shot? b. The shot was initially at rest. How much work was done on it to give it this kinetic energy? 8. A 2.00-kg text book is lifted from the floor to a shelf of 2.10 m above the floor. a. What is the gravitational potential energy relative to the floor? b. What is the gravitational potential energy relative to the head of a 1.65 m tall person? 9. A 50.0-kg ballistic shell is shot from a cannon at Earth's surface to a height of 4.00 x 10- m. a. What is the gravitational potential energy with respect to Earth's surface of the Earth-shell system when the shell is at this height? b. What is the change in potential energy of the system when the shell falls to a height of 2.00 x 102 m