A string is attached to the rear-view mirror of a car. A ball is hanging on the other end of the string. The c?

B

Because gravity is pulling down on the ball. The string is resisting that force so it's under tension. The cars circular motion is causing a centrifugal force that is swinging the ball toward the outside of the circle.

Friction has nothing to do with anything here. The air inside the car is in motion at the same rate as the ball. (unless you have a fan running). ( A ) is only part of the answer, ( C ) is even less a part of the answer - but a part of it nonetheless.

Only ( B ) describes all the forces acting on the object in question.

Hope this helps.

'av'a g'day mate.

")

Just Tension and Gravity

Against the law. You should have nothing in the windscreen to interrupt the view or distract the driver.

B.

Gotta be 'B'
A is static
C is static
D is moving circular motion but in contact with the floor or whatever.