A) Frictional force
B) Muscular force
C) Electrical force
D) Magnetic force
Correct Answer: A
Solution :
When muscular force is applied by Thaddeus in the form of pedaling, the bicycle moves. When he stops pedaling, the frictional force between the tires and the ground slows the bicycle. The direction of the frictional force is opposite to the direction of motion of the bicycle. Hence, the speed of the bicycle decreases. The correct answer is A.
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