[填空题]
In Problem 79 (Fig. 7–468zlvyl2v 1ae:a94 pnd ), what is the upper liz5xa-*9 xpmt nmzt9+xmit on mass m if it is to rebound from M, slide up the incline, stop, slide down the incline, and collide with M am x x+z9z9-tx5na pm*tgain? kg (Let A represent mass m, and B represent mass M.)
