Question

please help me friends

Answer 1

MASS = 4 Kg and 2 Kg
Force = 20 N on 4 kg 
thus 10 kg on 2 kg

To find 
normal reaction=mass x acceleration due to gravity

Solution
for 4 kg ......(1)

mass=4 kg
acceleration due to gravity = 9.8 m/s
=4 x 9.8 = 39.8

for 2 kg...........(2)
mass=2 kg
acceleration due to gravity = 9.8
=2 x 9.8 = 19.6

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Answer 2

Normal reaction = Mass × Acceleration..

So for 4 kg.

4× 9.8 = 39.6.

For 2 kg = 2×9.8 = 19.6