Which is not experiencing acceleration? a. a point on the outside of a spinning top whose rotational speed is constant b. a car on the freeway experiencing a net force of −120 n c. a submerged beach ball whose buoyant force is eight times the force of gravity on it d. a skydiver whose air resistance is equal to that of her weight

The correct answer to the question will be D. a skydiver whose air resistance is equal to that of her weight.

EXPLANATION:

As per the first option, the point is situated outside of the spinning top whose rotational speed is constant. When a body moves in a circular path, its direction is always changed which produces an acceleration. The point present outside of the spinning top moves in a circular path. Hence, it experiences an acceleration.

As per the second option, the car on the freeway is experiencing a net force of -120 N. Here, the car experiences  negative acceleration which opposes the motion.

As per the third option, a submerged beach ball whose buoyant force is eight times the force of gravity. Hence, there is net force on the submerged beach ball which will push the ball upward. Hence, the ball experiences an acceleration.

The third option is that the skydiver whose air resistance is equal to that of her weight. Here, the weight of the driver acts in vertical downward direction while air resistance acts in vertical upward direction. The net force acting on the driver is zero. Hence, the acceleration of the driver is zero.

measure their densities same density, same sub

i don't understand. explain it clearly