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Hey there!!
.
We know that P=F/Area of contact
.
F = mg= 5 kg × 9.8 m/s²= 49 N
In case (a)
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Area of a side = length × breadth
= 20 cm × 10 cm
= 200 cm²
= 0.02 m²
P= 49 /0.02= 2450 N/m²
.
In case (b)
Area= length × breadth= 40 × 20= 800= 0.08 m²
Pressure = 49/0.08= 612.5
.
Hope it helps :))
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