Author Question: Jerome pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and ... (Read 78 times)

scienceeasy · **on:** Jul 28, 2018

Jerome pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the ball's momentum?
a. 4.0 kgm/s
c. 15 kgm/s
b. 8.0 kgm/s
d. 20 kgm/s

Question 2

Two identical balls have the same amount of charge, but the charge on ball A is positive and the charge on ball B is negative. The balls are placed on a smooth, level, frictionless table whose top is an insulator. Which of the following is true?
a. They will move together with constant acceleration.
b. Since the force on A is equal but opposite to the force on B, they will not move.
c. Since the force on both balls is negative, they will move in the negative direction.
d. None of the above is correct.