During a collision with a wall, the velocity of a 0.69-kg ball changes from 22 m/s toward the wall to 12 m/s away from the wall. If the time the ball was in contact with the wall was 89 ms, what was the magnitude of the average force applied to the ball?

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?