A 140g rubber bullet hits a wall with a speed of 170ms what

Question

Solve the following question given below:

Question 1: A 14.0g rubber bullet hits a wall with a speed of 170m/s

Part A: If the bullet bounces straight back with a speed of 130m/s, what is the magnitude of the change in momentum of the bullet?

Question 2: A cardinal (Richmondena cardinalis) of mass 4.40×10² kg and a baseball of mass 0.144kg have the same kinetic energy.

Part A: What is the ratio of the cardinal's magnitude pc of momentum to the magnitude pb of the baseball's momentum?

I need help to determine the magnitude of the change in momentum of the bullet.