A pillar weighing 40 kg and a length of 3 m lies on the ground. What work needs to be done to put the pillar upright.

Since the center of mass of the pillar is located in the middle of its length, we can express the perfect work of lifting it vertically by the formula:
A = Ft * h / 2, where F = Ft = m * g (m is the mass of the column (m = 40 kg), g is the acceleration of gravity (we take g = 10 m / s ^ 2), h is the length of the column ( h = 3 m).
Let’s calculate the value of the perfect work of work:
A = Ft * h / 2 = m * g * h / 2 = 40 * 10 * 3/2 = 600 J.
Answer: It is necessary to perform work equal to 600 J.