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!