If the ball is in contact with the player's head for 20 ms, what is the average acceleration of the ball? (Note that the force of gravity may be ignored during the brief collision time.)
To find the average acceleration of the ball, we need to know the change in velocity and the time it takes for that change to occur. In this case, since the ball is in contact with the player's head for 20 ms, we can assume that the change in velocity occurs in that time interval.
Since the force of gravity can be ignored during the collision time, we can assume that the initial velocity of the ball before contact is equal to its final velocity after contact. This means there is no change in velocity during the collision, and therefore, the average acceleration is zero.
The formula for average acceleration is:
average acceleration = (change in velocity) / (time interval)
In this case, since there is no change in velocity and the time interval is 20 ms, we get:
average acceleration = 0 / 0.02 sec = 0 m/s^2
Therefore, the average acceleration of the ball during the 20 ms contact with the player's head is 0 m/s^2.