けんき => YSITD: 這樣的話就是 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). xk78 #58b1a0e5c34d4e932bb87519

けんき says to YSITD

這樣的話就是 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). xk78

at Sat, Feb 25, 2017 11:21 PM