本题目来源于试卷: Work Energy and Power，类别为 美国物理杯赛(Physics Bowl)
[单选题]
09.14: In the figure to the ,s b ei5zv++uy right, a box moves with speed 5 4d*vdoct9 r miy-2w+ e.00 m/s at the bottom of a rough, fixed inclined p 4v eryt*o9-wcm+ 2di dlane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?
A. 2400 J
B. 1920 J
C. 1200 J
D. 988.5 J
E. -187.5 J
参考答案: B
本题详细解析:
暂无
| 
