Question

A ladder 2.5 m long and 150 N weight has its center of gravity 1m from the bottom. A weight 40 N
is attached to the top end. The work required to raise the ladder from the horizontal position to the
vertical position is​

Answer 1

Answer:

Explanation:the answer is in the posted image

Answer 2

Answer:

The work required to raise the ladder from the horizontal position to the  vertical position is​ 250 J.

Explanation:

Given that,

ladder height = 2.5 m

Weight = 150 N

Attached weight = 40 N

Center of gravity = 1 m

We need to calculate the work done in raising the weight of ladder through a height of 1 m

Using formula of work done

$W=F\cdot s$

Put the value into the formula

$W_{1}=150\times1$

$W_{1}=150\ J$

We need to calculate the work done in raising the weight of ladder through a height of 2.5 m

Again using formula of work done

$W_{2}=40\times2.5$

$W_{2}=100\ J$

Now, The total work done is

$W=W_{1}+W_{2}$

$W=150+100$

$W=250\ J$

Hence, The work required to raise the ladder from the horizontal position to the  vertical position is​ 250 J.