关于速率和自由落体运动的题目（本人在海外留学,所以这个题目是英文的）1.Astreetballisdroppedfromadivingplatform(withanintialvelocityofzero).Useingtheapproximatevalueofg=10m/s².a)Throughwhatdist

Question

关于速率和自由落体运动的题目（本人在海外留学,所以这个题目是英文的）
1.A street ball is dropped from a diving platform( with an intial velocity of zero).Useing the approximate value of g=10m/s².
a) Through what distance does the ball in the first 0.8 seconds of its flight?(Assume g=10m/s²）
b) How far does it fall in the first 1.6 seconds of its flight?
2.Suppose Galileo's pulse rate was 80 beats per minute,how far does an object fall in this time when dropped from rest?
我知道答案,要把公式也写出来,谢啦.

Answer 1

这里的3个问题其实本质是完全一样的,就是求静止状况下开始的自由落体,在一定时间内下落的距离,只用到了一个公式,即：
s = 1/2gt²

1(a). s = 1/2gt² = 1/2 * (10 * 0.8²) = 3.2 m
1(b). s = 1/2gt² = 1/2 * (10 * 1.6²) = 12.8 m

2. s = 1/2gt² = 1/2 * (10 * 60²) = 18000 m

其中第2题给的每分钟心跳次数是没有用的信息,只需要知道1分钟等于60秒,并把时间代入公式即可.

希望对你有所帮助.