A force in the negative direction of an x axis is applied for 34 ms to a 0.40 kg ball initially moving at 16 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 32.4 N·s.
(a) What is the ball's speed just after the force is applied?
____m/s
(b) What is the average magnitude of the force?
___N