First slide

Work

Question

A ladder of mass 10kg is lying on horizontal surface. A body of weight 200N is attached to one end of ladder. If length is 5m and its centre of mass is at a distance of 2m from one end, the total work done in lifting the ladder to vertical position is

Moderate

A

6000J
B

4000J
C

1000J
D

1200J

Solution

$\begin{array}{l} W = W_{load} + W_{body} \\ W = m_{l} {gh}_{l} + m_{b} {gh}_{b} \\ W = [10 \times 10 \times 2] + [200 \times 5] \\ W = 200 + 1000 \Rightarrow W = 1200 J \end{array}$

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