6. At a given instant the football player at A throws a football C with a velocity of 20 m/s in the direction shown. Determine the constant speed at which the player at B must run so that they can catch the football at the same elevation at which it was thrown. Also, calculate the magnitudes of the relative velocity and relative acceleration of the football with respect to B at the instant the catch is made. Player B is 10 m away from A when A starts to throw the football. A 20 m/s K60 C B 10 m