It is an opinion or conclusion based off of incomplete information
The first thing you should remember is that the energy in this case will be given by the work done.
The work is defined as:
W = F * d
Where
F = Force
d = displacement.
Calculate it.
5 kg x 9.8 m / s ^ 2 x 21 m = 1029 J
Okay try to round the whole number and see if you can solve that should help you
It is where most of the data is, or where the majority of the data is
I believe the answer is 2
