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If the lower spring is cut, find acceler...

If the lower spring is cut, find acceleration of the blokcs, immediately after cutting the spring.

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Initial stretches `x_("upper")=(3mg)/(k)& x_("lower")=(mg)/(k)`
On cutting the lower spring, by virture of non-impulsive nature of pring the stretch in upper spring remains same. Thus,
Lower block :
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