1 (1)A=∫Fdx=(528x+384x2)dx 198+11.2=31J (2)A=hm2 U=/24 =534m/s 目录结束=19.8+11.2 =31J 2 m v = A = 5.34 m/s A = ( x+ ) 2  0.5 x 1 (1) = F dx 52.8 38.4x d A= mv 2 1 2 (2) 目录 结束