Question

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Answer 1

Fbd for block A

F1 - 2T =ma1
20- 2T = ma1

Fbd for block B
T =8
T = ma2 =a2
8 = ma2 = a2

20 - 16 =ma1 =a1
a1 = 4


Now take s =0.5m
Relative acceleration a = a2- a1
U = 0
0.5 = 1/2 a t^2
t ^2 = 1/a = 1/(a1-a2) =1/(8-4)=1/4=0.25
t = 0.5 s