The work done in lifting 30kg of bricks to a height of 20m on a building under construction is?

The work done in lifting an object can be calculated using the formula ( W = mgh ), where ( W ) is the work done, ( m ) is the mass (30 kg), ( g ) is the acceleration due to gravity (approximately ( 9.81 , \text{m/s}^2 )), and ( h ) is the height (20 m). Substituting the values, ( W = 30 \times 9.81 \times 20 ), which equals 5886 Joules. Thus, the work done in lifting the bricks is 5886 Joules.