けんき => YSITD: Because both energy and momentum are conserved. Energy is quadratic in velocity and momentum is linear. If the energy of two balls went into one ball, the resulting velocity would only be 1.4x the original, meaning momentum would be lost. Momentum can't be lost, so that can't happen (at least not without something else getting involved). 剛剛我也想到這個耶w，結果推一推以為是自己想錯w #58b19c2fc34d4e932bb87383

けんき says to YSITD

Because both energy and momentum are conserved. Energy is quadratic in velocity and momentum is linear. If the energy of two balls went into one ball, the resulting velocity would only be 1.4x the original, meaning momentum would be lost. Momentum can't be lost, so that can't happen (at least not without something else getting involved). 剛剛我也想到這個耶w，結果推一推以為是自己想錯w

at Sat, Feb 25, 2017 11:01 PM