∵m=45kg,g=10N/kg,∴该同学的重力为:G=mg=45kg×10N/kg=450N;从图可知,跳一次所用时间为t1= 1 3 s,则1min内所跳的次数n= 60s 1 3 s =180;起跳的最大高度h=0.1m,∴克服重力做功为:W=G×nh=450N×180×0.1m=8100J;而t=1min=60s,∴1min内克服重力做功的平均功率为:P= W t = 8100J 60s =135W.故选B.