Two similar planes of mass m each having failed engines are being pulled by a stronger plane in air. At t=0, they are travelling at uniform speed producing tension TA in rope A. Tension in rope B just after the beginning of acceleration is
A
TA
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B
TA−ma
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C
2TA+ma
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D
TA2+ma
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Solution
The correct option is DTA2+ma Before acceleration tension at rope B is TB=12× tension at rope A=TA2 After acceleration tension at rope B , T′B=TB+ma=TA2+ma