Medal and follow
A 0.15-kilogram baseball is pitched horizontally at +42 meters per second and is hit by a bat, causing it to move horizontally at -42 m/s.
If the bat and ball were in contact for just 7.5 × 10-4 seconds, what was the average force exerted on the ball by the bat?
A. 0 kg-m/s
B. 6.3 kg-m/s
C. 12.6 kg-m/s
D. 560 kg-m/s

Question

Medal and follow 
A 0.15-kilogram baseball is pitched horizontally at +42 meters per second and is hit by a bat, causing it to move horizontally at -42 m/s.
If the bat and ball were in contact for just 7.5 × 10-4 seconds, what was the average force exerted on the ball by the bat?
A.	0 kg-m/s
B.	6.3 kg-m/s
C.	12.6 kg-m/s
D.	560 kg-m/s

anonymous · Answer

A 3-kilogram block slides along on a frictionless surface at 4 m/s north, and strikes an obstacle that exerts an impulse on the block of 6 N-s to the south. What is the speed of the block after the collision?
	A.	2 m/s
	B.	3 m/s
	C.	4 m/s
	D.	6 m/s

A 0.15-kilogram baseball is pitched horizontally at +42 meters per second and is hit by a bat, causing it to move horizontally at -42 m/s.
What was the magnitude of the ball's change in momentum?
	A.	0 kg-m/s
	B.	6.3 kg-m/s
	C.	12.6 kg-m/s
	D.	560 kg-m/s