Working out and answer please

Question 1 A 300 g block is compressed 10 cm against a spring of force constant, k = 0.02 N/cm while resting on a frictionless inclined plane. When the block is released, it rises vertically until coming to rest. Compute the maximum height reached by the block. (5 m) Given ml = 2.5 kg is moving to the right at 6 m/s while m2 = 4 kg is moving to the left at 3 m/s. They collide head on and m2 is moving at 1.2 m/s to the left. Compute the (i) final velocity of ml after the collision. (3 m) (ii) total final kinetic energy after the collision. (2 m)