快科技3月21日消息，两车以60公里时速对撞，是否等效于一辆车120公里时速撞墙的话题引发全网热议。
张朝阳在社交平台发文，用通俗解释和物理公式把这个问题彻底讲清。
张朝阳指出，从左边车辆的参照系来看，右边车辆确实是以120公里时速撞过来，速度叠加本身没有问题，但撞后两辆车都以60公里时速向左边行进。
也就是说，动能并未完全变成车祸热能，
左边是质量有限的车辆，而非质量无限大的刚性墙，这直接决定了碰撞后的能量分配与破坏程度。
他给出具体动能计算，两车对撞的总动能损失为 0.5m (1202) 减去 0.5 x 2m (602)，再换算成焦耳，最终转化为车祸中的热能，比120公里撞墙动能损失小的多。
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