(a) Suppose you throw a football. At some instant, when the ball is in contact with your hand, your hand exerts a force of 100 N on the ball in the +x direction. What is the force of the ball on your hand?
100
According to Newton's third law of motion, the force of the ball on your hand would be equal in magnitude but opposite in direction to the force of your hand on the ball.
Therefore, the force of the ball on your hand would also be 100 N, but in the -x direction.
To determine the force of the ball on your hand, we can use Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
According to Newton's third law, the force of the ball on your hand would be an equal magnitude but in the opposite direction to the force your hand exerts on the ball. So, if your hand exerts a force of 100 N in the +x direction, the force of the ball on your hand would also be 100 N but in the -x direction.
This means that the force of the ball on your hand is 100 N in the -x direction.