In which process does an object not gain potential energy?
A.A stone tossed upwardly in a gravitational field
B.A bag carried parallel to the Earth's surface
C.A pendulum swinging up
D.A kid running up a hill
E.An airplane going above the clouds
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B, because direction of motion of bag is perpendicular toh the gravitational force which is acting vertically downward, since energy is the product of force and displacement the vertical component of displacemt is 0. So, 0*force=0
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