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Acceleration

A block of ma...

Question

A block of mass $2 k g$ 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

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

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