The patient recovered from the illness________and three weeks later, he left the hospital.
王洪同学参加学校举行的跳绳比赛,他1min跳了120次,每次跳起的高度为5cm已知他的质量是40kg,求:(1)王洪同学每次跳起时需要做多少功?(2)王洪同学跳绳是的功率是多少?