Question

In the arrangement shown, the normal reaction
between the block A and ground is
(1) 10N
(2) 20 N
(3) 40 N
(4) Zero​

Answer 1

Answer: The rope is considered to be light so tension will be same on both its sides let it be T and let normal reaction be N.

For block B , T - 2g = 0

=> T = 20N

Now for block A, T + N = 4g

[ normal reaction on block a with respect to ground will be upward direction .]

N = 40 - 20 = 20 N