Question

Newton’s second law relates an object’s acceleration to its mass and the net force acting on it. Does Newton’s second law apply to a situation in which there is no net force? Select the best explanation.

A. Yes. The law applies and it tells us that the object has a nonzero acceleration.

B. No. The law applies only to situations in which a net force acts.

C. No. The law does not apply because a zero net force would produce an infinite acceleration.

D. Yes. The law applies and it tells us that the object has constant velocity.

Answer 1

using 2nd law of motion

F = dp/ dt

for net force to be zero

F = 0

dp / dt = 0

i. e. momentum remians constant, hence velocity of the object is constant

so option (d) is correct

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