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Q.

A body of mass 2 kg is placed on a smooth horizontal surface. Two forces  F1 = 20N   and  F2 = 103N  are acting on the body in directions making angle of 300and 600to the surface. The reaction of the surface on the body will be

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a

20N

b

25N

c

5N

d

zero

answer is D.

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Detailed Solution

N+F1Sin300+F2Sin600= mg⇒ N+20×12+103.32=20⇒ N = 20−25 = −5Normal reaction is coming negative means the body is lifted from the ground and hence N = 0
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