Question

which will exert more pressure 100 kg mass on 10 m square or 50 kg mass on 4 m square give reasons

Answer 1

in first case,
p=f/a
=100/10=10pascal.
in second case
p =f/a
=50/4=25/2=12.5pascal.
therefore in second case exert more pressure.
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Answer 2

pressure = mass/area

first case:
m=100kg
ar=10
pressure=100/10=10 units pressure

second case:
m=50kg
ar=4
pressure=50/4=12.5 units pressure

12.5>10

so, in second case, pressure is more

hope it help u...