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  4. A string is used to pull a block of mass m vertically up by a distance h at a constant acceleration (g/3). The work done by the tension in the string is

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Q. A string is used to pull a block of mass $m$ vertically up by a distance $h$ at a constant acceleration $\frac{g}{3}$. The work done by the tension in the string is

Work, Energy and Power

Solution:

$T-m g= m a$
$T =m(g +a)$
$=\frac{4}{3} m g$
Work (w) $=T . h $
$=\frac{4}{3} m g h$

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