Q.

A body of weight 50 N placed on a horizontal surface is just moved by a force of 282 N. The frictional force and normal reaction are

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a

2 N, 3N

b

5 N, 6 N

c

10 N, 15 N

d

20N, 30N

answer is D.

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Detailed Solution

Frictional force,  f=28.2cos45°=28.2×12=20 NNormal reaction,  R=50-28.2  sin45°=50-20=30 N
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A body of weight 50 N placed on a horizontal surface is just moved by a force of 282 N. The frictional force and normal reaction are