A 0.45 kg baseball is pitched at -47m/s. After being hit by the batter it has a velocity of 50 m/s. The batter generates 30,000N of force in the swing.

Why is one of the velocities negative?

What is the ?V for the baseball

What is the change in momentum experienced by the baseball?

For how long is the ball in contact with the bat?

What would happen to the hit velocity of the ball if the contact time was increased (assume the force, mass and pitch velocity do not change)