its backwards. IMpact is not force. the arrow would pierce insantly thrhgt me. overpenetrate. your sicence is Wrong. the arrow can go at lgith sped. but if its onyl an arrow. its a small. the sheidl can jsut fpcus ont aht Little spo the arrow is hitting. a 120mm hits a larger area and hsa LOT mroe impact and overall damage.meaning the hsield msot waste tiself to block it. the arrow wouldnt break the shield. and the arrow woudl eitehr boucne of or just loose all momentum. Force deosnt equal impact. force is basicly speed when talkign abotu acceleration.newtons are energy/energy) x distance. that would make more Imapct and damage.