7. Why did a ball thrown to the air fall back to the ground?
A. Gravity caused the ball to fall.
C. Acceleration caused the ball to move fast
B. Air caused the ball to fall on the ground.
D. The weight of the ball made it move faster
8. A bicycle moves faster on a cemented road than on a bumpy road. Why?
A Friction is greater on a cemented road.
C. There is no friction on a cemented road
B. Friction is lesser on a cemented road.
D. The bicycle can roll only on a cemented road

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