A ball of mass m is thrown upward with a velocity `upsilon`. If air exerts an average resisting force F, the velocity with which the ball returns to the thrower is
A. `sqrt((mg)/(mg+F))`
B. `vsqrt((F)/(mg+F))`
C. `vsqrt((mg-F)/(mg+F))`
D. `vsqrt((mg+F)/(mg-F))`