物体A以每秒0.5m的速度在水平面上做匀速直线运动,此时弹簧测力计的读数为2N
问2S内拉力所作的功和它的功率
人气：335 ℃ 时间：2019-08-25 05:36:54
解答
F=2N
S=vt=0.5m/s×2s=1m
W=F/S=2N/1m=2J
P=W/t=2J/2s=1W
答：2S内拉力所作的功为2J
功率为1W.
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