Question

1.
Find initial accelerations of A and B respectively,
when string is cut
B
E
H
А
m
(1) gt .g1
(3) gt, gt
(2) gh, g
(4) gf , g/24​

Answer 1

Before cutting T = mg

after cutting string

aA = mg/m = g↓

aB = mg/m = g↑

Answer 2

Answer:

(A)

Force on Spring initially = mg + mg

= 2mg ( downwards )

After the string is cut:

Tension in spring = force on spring initially

Force on spring after the string is cut = mg ( downwards )

Now, the tension in spring > mg

so the spring will pull the mass b upwards with a force = 2mg

BY NLM:

2mg - mg = ma

g = a ( upwards)

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