According to the one who requested this, Doraemon is 129.3 cm and 129.3 kg. I will assume he fell the same distance of the boy (dunno what is his name in English, I only watch Chinese translation of Doraemon)
Doraemon's height: 52 px or 1.293 m
Height from ground to where the boy was: 426 px or 10.6 metres
Doraemon is 129.3 kg.
129.3*10.6*9.81 = 13 445.3839 Joules, Wall level