Question

A 2kg box sits 3 kg box which sits 5kg box the 5kg box rests ontable top what is normal exerted by 5kg on 3kg box

Answer 1

Total mass on 5 kh box = 2+3= 5kg
So normal force on 5kg box = 5×9.8 = 49N

This will be force that is exterted on the 5kg box by 3kg box in downward direction. And by third law of Newton, the sMe force will act on 3kg box by 5kg box in upward direction.

So normal force on 3kg box by 5kg box is 49N in upward direction