A Baseball of Mass M, Initially at Rest, Is Struck

Multiple Choice

A baseball of mass m, initially at rest, is struck by a bat so that it acquires a speed v. If t represents the duration of the collision between the bat and the ball, which one of the following expressions determines the magnitude of the average force exerted on the ball?

A) (1/2) mv²
B) mv/t
C) (1/2) mv²t
D) mt²/(2v)
E) mvt