Question

An object with a mass of 21 kilograms is lifted through a distance of 7 meters how much work is done

Answer 1

We have: W = F × s
W = m×g×s
Here, m = 21 Kg  [ Given ]
g = 9.8 m/s²         [ constant value for earth system ] 
s = 7 ,                  [ Given ]

Substitute their values into the expression:
W = 21×9.8×7
W = 1440.6 Joules

In short, Your Final Answer would be 1440.6 J

Hope this helps!