A 70.0-kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.0200 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?
【简答题】A long time ago, there was a seed and because he was only a seed, nobody noticed him. Thus, feeling inferior (低级的), the seed gave no importance to his existence (存在). Then one day, a wind picked him u...