[填空题]
Tarzan plans to cross a gorge by+ykq;a s-ws3tjn)urc: 0igi2 swinging in an-):bxs l 0gdojpra9 2z arc from a hanging vine (Fig. 5–41). If his arms are capable of exerting a force of 1400 N on the vine, what is the maximum pzrx-agol:sb2 j9d )0 speed he can tolerate at the lowest point of his swing? His mass is 80 kg, and the vine is 5.5 m long.
