NCERT class 9 science book chapter 10 example 10.6
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Answer:
a 2450pa. b 612.5pa
Explanation:
a ) p=F/A
f=m×g
f=5×9.8=49n (it is constant because m and g are constant
a)a=20cm×10cm= 200cm^2=0.02m^2
b)a=40cm×20cm= 800cm^2=0.08m^2
a)49n/0.02m^2=2450pa
b)49n/0.08m^2=612.5pa
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