Question 98 of 183

A uniform chain of length $3m$ and mass $3kg$ overhangs a smooth table with $2m$ laying on the table. If $K$ is the kinetic energy of the chain in $J$ as it completely slips off the table, then the value of $K$ is
$\left(\text{Take}g=10m{s}^{-2}\right)$

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Answer: 40

Apply conservation of energy ${U}_{i}+{K}_{i}={U}_{f}+{K}_{f}$
$-1\times 10\times \left(\dfrac{1}{2}\right)+0=-3\times 10\times 1.5+KE$
$\text{K.E.}=45-5$
$\text{K.E.}=40J$