【正文】
4 0 0 0=8000Wor 8Kw Sum up ? Work 。 work done 。1 Joule。 power。 1Watt. ? Work done=2020N X 2m=4000J ? Power=4000J 247。 =8000w or 8kw Homework ? The lawnmower move needs 80 newtons, its engine can apply 50 newtons. A lady pushed the lawnmower along a straights line for 40 meters. How much work has the lady done?