A block of mass m is placed in contact with one end of a smooth tube of mass M (see Fig.). A horizontal force F acts on the tube in each case (i) and (ii). Then, immediately after applying force, the acceleration of m and M are:
A
am=0 and aM=FM in (i)
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B
am=aM=FM+m in (i)
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C
am=aM=FM+m in (ii)
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D
Force on m is mFM+m in (ii)
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Solution
The correct option is D Force on m is mFM+m in (ii) In the first case, m will remain at rest. aM=FM
In the second case, both will accelerate: am=aM=FM+m
In the second case, force on m=mam=mFM+m