You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
A) Work up is -, and the work down is -.
B) Work up is +, and the work down is +.
C) Work up is -, and the work down is +.
D) Work up is +, and the work down is -.
Question 2
You try to pull an object by tugging on a rope attached to the object with a force . The object does not move at all. What does this imply?
A) There are no other forces acting on the object.
B) The inertia of the object prevents it from accelerating.
C) The object has reached its natural state of rest and can no longer be set into motion.
D) The rope is not transmitting the force to the object.
E) There are also one or more other forces that act on the object with a sum - .
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