Question

which will exert more pressure 100kg mass on 10m2 or 50kg mass on 4m2 . give resaon

Answer 1

Assuming g to be
$10 \: m {s}^{ - 2}$
Case 1:
mass = 100 kg
weight = 1000 N
area = 10 m^2
pressure = weight/area = 100 Pa

Case 2:
mass = 50 kg
weight = 500 N
area = 4 m^2
pressure = weight/area = 125 Pa

Answer:- Second one will exert more pressure