Answers

2016-04-01T08:36:13+05:30
• meaning of 1 Pa(pascal) is nothing it is just a unit of pressure named After scientist Blaise pascal

• m = 40 kg
g = 10m/s²

F = mg = 400N

, Now , P = F/A = 400/0.04 = 10000Pa
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2016-04-01T19:37:30+05:30
1 Pascal is defines as the force of one Newton exerted on a body of area one square unit.
Force= mass of the body* acceleration.
Here, the acceleration is taken as the acceleration due to gravity.
Therefore,
Force = mass* acceleration due to gravity.
The acceleration due to gravity is denoted as g; and, it's value is 9.8 m s⁻².
Therefore, 
F=mg
=40*10
= 400 N
Pressure= Force exerted by the body/ area 
= 400/0.04
= 40000/4 = 10000 Pa

Thank you.
Hope this may help you.

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