If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To calculate their kinetic energy would you have to include the degrees they moving in? (Eg ball A after collision : 0.5 x mass x velocity squared x sin 40)
