First slide

Work done by Diff type of forces

Question

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain onto the table ? (g = 10 m/ $s^{- 2}$ )

Moderate

A

7.2J
B

3.6J
C

120J
D

1200J

Solution

$W = \frac{m g l}{2} = (\frac{60}{200}) 4 \times 10 \times (\frac{60}{2}) \times 10^{- 2}$
W =3.6 J

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