Please I need help with this 3 questions no explanation needed thanks

1.Geologists estimate that the Chicxulub crater in Mexico was caused by a 2.3 x 1017 kg asteroid travelling 1.6 x 104 m/s when it hit the earth. Assuming the earth was stationary when it was hit and that the collision was one dimensional, the change in the earth's velocity due to the collision would be A x 10B m/s. The value of A is 2.An 8.00 kg object is travelling south at a velocity of 3.40 m/s when it collides with a 12.0 kg object travelling east at 4.00 m/s. The objects lock together. The speed of these two objects immediately after the collision is . 3.An 8.00 kg object is travelling south at a velocity of 3.40 m/s when it collides with a 12.0 kg object travelling east at 4.00 m/s. The objects lock together. The direction of these two objects immediately after the collision is