A person is standing with his shoes on the ground each shoe having an area of $200$ $c m^{2}$ in contact with the ground. When he has both feet on the ground he exerts a pressure of $9000$ $N m^{- 2}$ . What is the mass of the person?(Take g $= 10 m / s^{2}$ )

45

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36

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18

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60

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Solution

The correct option is B $36$ kg
force = pressure area
=9000 400* $10^{- 4}$
= 360 N
180 = M*g
M= 360/10 =36 Kg

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