g( gravitational acceleration)=-9.81 m/s^2
m(mass) = 70.0 kg
According to Newton's second law of motion:
"F=ma"
Force is equal mass per acceleration therefore
W=mg
This is because weigth is the force of gravity acting in a body and "a" is replaced by "g" because "g"
is gravitational acceleration
Therefore:
W= mg
W= (70.0 kg) (-9.81m/s^2)
W= -686.7 N
The "N" means newton which is (kg m/s^2)