The law of inertia says that
A) if there is no force on a body, the body will have no acceleration.
B) if there is a force on a body, the body will have a changing acceleration.
C) if there is a force on a body, the body will have an unchanging velocity.
D) if there is no force on a body, the body will have a changing velocity.
E) if there is a force on a body, the body will have no acceleration.
Question 2
A batter hits a foul ball. The 0.14-kg baseball that was approaching him at 40 m/s leaves the bat at 30 m/s in a direction perpendicular to the line between the batter and the pitcher. What is the magnitude of the impulse exerted on the baseball?
A) 9.8 N s
B) 1.4 N s
C) 3.5 N s
D) 5.6 N s
E) 7.0 N s
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