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

Question

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 (A) (2/3) m g h (B) (-m g h/3) (C) m g h (D) (4/3) m g h

Tardigrade Admin · Accepted Answer

T-m g= m a T =m(g +a) =(4/3) m g Work (w) =T . h =(4/3) m g h

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

$\frac{2}{3} m g h$

$\frac{- m g h}{3}$

$m g h$

$\frac{4}{3} m g h$

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

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

32​mgh

3−mgh​

mgh

34​mgh