18. In the arrangement shown, the normal reaction
between the block A and ground is
(1) 10 N
(2) 20 N
(3) 40 N
(4) Zero
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Answer:
(3) 40N
the normal reaction is acting upwards and mg is acting towards the ground. Mass of the block is 4 kg but it is not moving in either direction i.e. neither upwards nor downwards so the normal reaction will be equal to mg that is 40N.
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Answer:
N=20N
Explanation:
see the free body diagram (f.b.d) of both the blocks,
from 2nd f.b.d,
T=20N
from 1st f.b.d,
T+N=40N
20N+N=40N
N=20N
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