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Q.

A block of mass 2kg moves under the influence of external forces on a rough horizontal surface. At some instant, it has a velocity of 1 m/sec. due south and acceleration of 1 m/sec2 due east. The force of friction acting on it is F.

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a

F acts due west

b

F acts due north

c

F acts in the south-west direction

d

The magnitude of F can not be found from the given data.

answer is B.

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Detailed Solution

Kinetic friction acts opposite to relative velocity w.r.t. contact surface.
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