Agust of wind blowing east pushes against a ball. when will the wind do work on the ball?

when the ball moves in the same direction in which the wing blows (to the east).

Explanation:

Work is done when a force causes motion of an object along the same direction as the force acts.

For example, if a person holds up a heavy bowling ball but such person translates the ball horizontally, the motion and the force are perpendicular meaning that person is not doing any work on the ball.

On the other hand, if the person pushes or pulls the ball with a force parallel to the ground (motion), now wor is done:

W = Force × displacement × cos (angle between the force and the displacement)

If the angle is 90°, cos (90°) = 0 ⇒ W = 0.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.