1.

From what minimum height `h`must the system be released when spring is unstretches so that after perfectly inelastic collision `(e =0)` with ground, `B` may be lifted off the gound: (Spring constant `=k)` A. `mg //(4k)`B. `4mg//k`C. `mg//(2k)`D. None of the above

Answer» Correct Answer - B
Just after collision with ground, Applying `COE`
`(1)/(2)mv^(2) +mgx +(1)/(2) kx^(2) = (1)/(2)m (2gh) +0 +0`
`rArr (1)/(2) mv^(2) gt 0 rArr h gt 4mg//k`


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