Aforce of 200n acts on a surface of area 10cm2 normally calculate the pressure exerted on the surface

The SI unit of pressure is the pascal (Pa). It is a derived unit equal to 1 newton per square meter (1 N/m²).

Your pressure is ...

... (200 N)/(10 cm²) × (100 cm/m)² = 200,000 Pa

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg