27. A horizontal force F pulls a 20 kg box at a constantspeed along a

1.	27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J
Answer» ANSWER: F=fmg g=9.8m/s2 f=0.25 m=20 F=0.25×20×9.8=49 W=Fx =49×2=98

27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J

Answer»

ANSWER:

F=fmg

g=9.8m/s2

f=0.25

m=20

F=0.25×20×9.8=49

W=Fx

=49×2=98

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27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J​

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27. A horizontal force F pulls a 20 kg box at a constantspeed along a horizontal floor. If the coefficientof friction between the box and the floor is 0.25,how much work is done by the force F in movingthe box through a distance of 2 m?(a) 49 J (b)98J (c) 147J (d) 196J