Body weight 1 kg. Calculate what work needs to be done to lift this body to a height of 2 m.

Answer: 20 J.
Explanation of the solution to the problem: to solve this problem, you must use the following formula:
A = F * l, where F is the force of gravity in n, l is the length of the path traveled in m (in our case, this is the height).
Moreover:
F = m * g, where m is the body weight in kg, g is the acceleration of gravity, g = 10 n / kg.
Now we substitute all known values into the formula and get:
A = m * g * l = 1 * 10 * 2 = 20 J.