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A block of mass $$2\ kg$$ lies on horizontal surface and it is subjected to a vertical downward force $$30\ N$$ as shown in figure. The contact force between block and surface 
1027325_314d57b5e0c34a749b4313c7bd12d1e2.png


A
30 N
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B
0 N
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C
20 N
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D
50 N
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Solution

The correct option is D $$50\ N$$
Forces acting on the block are weight and 30N downwards
As the block is at rest a all the downward force are balanced by contact force between block and floor which acts vertical upwards
Contact force=$$20+30=50$$N

Physics

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