Step-by-step explanation:
Hey there!
According to the question;
Load (l) = 500 kg
Effort (e) = 100 N
Load distance (ld) = 20cm
Effort distance (ed) = ?
According to the principal of lever;
L*LD = E*ED
500*20 = 100*ED
ED = (500*20)/100
Therefore, the Effort must be applied at 100 cm.
Hope it helps!