number 6 please. I\'m having issues with computing the initial and final momenta

Question

number 6 please. I'm having issues with computing the initial and final momenta and kinetic energies. Do I need all 4 momenta, or 2?

5. Two gliders moving toward each other, one of mass 200 g and the other of 250 g, collide on a frictionless air track. If the first glider has an initial velocity of 25.0 cm/s toward the right and the second of -35.0 cm/s toward the left, find the velocities after the collision if the collision is perfectly elastic. . A 30g ball, m, collides perfectly elastically with a 20g ball, m. If the initial velocities are v 50.0 cm/s to the right and v2i 30.0 cm/s to the left, find the final velocities Vir and v2r Compute the initial and final momenta. Compute the initial and final kinetic energies. A 3g bullet is fired at 200 m/s into a wooden block of 10-kg mass that is at rest. If the bullet becomes embedded in the wooden block, find the velocity of the block and bullet after impact. A 25.0-g bullet with an initial speed of 400 m/s strikes a 5-kg ballistic pendulum that i initially at rest. (a) What is the speed of the combined bullet-pendulum after the collision? (b) How high will the pendulum rise?

Explanation / Answer

Since here are two bodies collide,so you have to put all four momentum,two initial and two final..

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