JEE MAIN - Physics (2021 - 26th August Morning Shift - No. 21)
A uniform chain of length 3 meter and mass 3 kg overhangs a smooth table with 2 meter lying on the table. If k is the kinetic energy of the chain in joule as it completely slips off the table, then the value of k is ................. . (Take g = 10 m/s2)
Answer
40
Explanation
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From energy conservation
Ki + Ui = kf + Uf
$$0 + \left( { - 1 \times 10 \times {1 \over 2}} \right) = {k_f} + \left( { - 3 \times 10 \times {3 \over 2}} \right)$$
$$-$$5 = kf $$-$$ 45
kf = 40 J
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