A football player kicks a 0.41-kg football initially at rest…

A football player kicks a 0.41-kg football initially at rest, and the ball flies through the air. If the kicker’s foot was in contact with the ball for 0.051 s and the ball’s speed after the collision is 21 m/s, what was the magnitude of the average force on the football?

Two forces F→1{“version”:”1.1″,”math”:”F→1″} and F→2{…

Two forces F→1{“version”:”1.1″,”math”:”F→1″} and F→2{“version”:”1.1″,”math”:”F→2″}  act on a particle. As a result, the speed of the particle increases. Which one of the following is NOT possible?