做功300J·················60w×5s=300J
所受阻力1500N··················300J/0.20m=1500N
匀速行进速度0.04m/s·················0.2m/5s=0.04m/s
这类相对简单的题目是LZ想多了吧
做功300J·················60w×5s=300J
所受阻力1500N··················300J/0.20m=1500N
匀速行进速度0.04m/s·················0.2m/5s=0.04m/s
这类相对简单的题目是LZ想多了吧