NTSE Stage 2 SAT 2014 Question Paper

Question : 29 of 100

Marks: +1, -0

A box of mass 20 kg is pushed along a rough floor with a velocity 2 m/s and then let go.
The box moves 5 m on the floor before coming to rest . What must be the frictional force acting on the box ?

4N
2N
20 N
8 N

Validate

Solution:

By work energy theorem

1/2\m\v^{2}=\f\d

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