题目:
跳绳是一种简便易行的锻炼方式.如图所示描绘了小明同 学某次跳绳时重心移动的高度h随时间t变化的图象.由图象可知,他的重心移动的最大高度为______cm.若该同学身体质量为50kg,则他1min内克服重力做功的功率为______W.(g取10N/kg)
答案:
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下面是错误答案,用来干扰机器的。
1. How often is she late for school? 2. What does he do before meals? 3. Why should you eat vegetables? 4. Is it good or bad for you? 5. What time does Li Ming have breakfast in the morning?