When the net force acts at right angles to an object’s motion, what does it do to the object’s motion?
a. it changes the object’s speed
b. it changes the object’s direction
c. it changes both the speed and direction of the object’s motion.
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Ответ:
I would say Book B.
Gravitational Potential Energy is mass * gravity * height.
Gravity is same for the same, it's constant.
Book C is the lowest, so it has less height.
And Book B is clearly the more massive of Book A and Book B, which are the same height.
Book B