Please I need help with this 4 questions

1.Calculate the momentum of the earth due to its revolving around the sun. 2.A hammer hits a nail with an initial force of 12 kN. For the next 0.050 s this force decreases linearly to zero. a) Sketch a force versus time graph for the situation described above. b) Calculate the magnitude of the impulse provided by the hammer. 3.A 2.0 kg ball travelling 3.0 m/s east strikes a stationary 2.0 kg ball. After the collision the first ball travels 2.6 m/s [300 N of E] and the second ball travels 1.5 m/s [600 S of E]. Show that the collision was elastic. 4.A 32.0 g bullet hits and becomes embedded in a stationary 5.00 kg block of wood. If the kinetic energy of the block of wood and bullet after the collision is 92.4 J, what was the initial kinetic energy of the bullet