lder has an impulse of 12000 Ns, what is the change

Two rocks collide in outer space, before the collision one rock had a mass 12kg and velocity (4200,-2700,2450)m/s. The other rock has a mass of 7kg and a velocity (-700,2200,3650)m/s. A 2kg chunk of the first rock breaks off and sticks to the second rock. After the collision, the 10kg rock has velocity (1500,350,1950)m/s. After the collision what is the velocity of other rock whose mass is now 9kg?

The Moon’s craters are remnants of meteorite collisions. Suppose a fairly large asteroid that has a mass of 4.95 × 1012 kg (such an asteroid is about a kilometer across) strikes the Moon at a speed of 14.5 km/s relative to the Moon. What is the change in kinetic energy, in joules, in the collision? Such an event may have been observed by medieval English monks who reported observing a red glow and subsequent haze about the Moon.

You are investigating a collision between three boats on a lake. You know the mass of each boat, aswell as their initial velocities. Boat A: Mass: 451kg, Initial Velocity: 8x̂ Boat B: Mass 512kg, Intial Velocity: 2x̂-6ŷ Boat C: Mass 575kg, Intial Velocity: ? Intial Velocities given in m/s. After the collision, the GPS devices on boats A and B agree that the velocity was (−3 m/s)x̂ +(4 m/s)ŷ. Unfortunately, the captain of boat C claims their GPS tracker was destroyed in thecollision. What was the velocity of boat C just before the collision?