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Q.

A $60 k g$ girl and her $45 k g$ brother are at rest at the centre of a frozen pond. He pushes her so that she slides away at $2.4 m / s$ .
How much total work is done approximately ? (Ignore friction).

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a

$58 J$

b

$170 J$

c

$350 J$

d

$400 J$

answer is D.

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Detailed Solution

$W = ∆ K = \frac{1}{2} \times 60 \times 2 . 4^{2} + \frac{1}{2} \times 45 \times 3 . 2^{2} = 403.8 J$

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