# Question #da71d

Dec 20, 2017

The work done is $= 3990 J$

#### Explanation:

Let the acceleration due to gravity be $g = 9.8 m {s}^{-} 2$

The potential energy of the drum at the top of the plane is

$P E = m g h = 200 \cdot 9.8 \cdot 1.5 = 2940 J$

The work done by the frictional force is

${W}_{F} = {F}_{r} \cdot d = 150 \cdot 7 = 1050 J$

The total work is

$W = P E + {W}_{F} = 2940 + 1050 = 3990 J$