the work done by friction in 10 s is

1.	the work done by friction in 10 s is
Answer» 200J `-200 J` 600 J `-600 J` Solution :The frictional FORCE and the displacement are in opposite direction, therefore the angle between frictional force and displacement is `theta=180^@`. Thus, work done by the friction is `W_f=fd COS 180^@ =(2 N) (100 m) cos 180^@=-200 J`

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