Which statement correctly applies to a spinning mobile that changes its velocity over a period of time? A. The combination of all forces acting on it is zero.

B. No net force is acting on it.

C. Forces are acting on it.

D. A nonzero net force is acting on it.

D

Explanation:

First, we know that the acceleration is defined as the ratio of change of the velocity.

This means that, if we have a change in the velocity, then we also have acceleration.

And by Newton's second law we know that:

F = m*a

Force equals mass times acceleration.

So if we have acceleration different than zero, then we should also have force different than zero.

So we must have a nonzero net force acting on it.

The correct option is D

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