如图所示是蹦床运动员表演的情景,运动员从最低点到达最高点的过程中,运动员的动能和重力势能变化情况分别是( )
① ;②
;③
;④
.
实验次数 | U/V | I/A | R/Ω |
1 | 3 | 0.26 | 11.5 |
2 | 2.4 | 0.2 | 12 |
3 | 2 |
tooth sleep little rush luck |
Matt: Why were you late for class today, Kevin?
Kevin: My alarm clock didn't go off! I kept , and when I woke up it was already 8:00 a.m.!
Matt: Oh, no!
Kevin: So I just quickly put on some clothes and out of the door. Matt: You didn't eat breakfast, did you?
Kevin: No, I didn't even brush my or wash my face! But before I got to the bus stop, the bus had already left.
Matt: Then how did you get here?
Kevin: , Carl's dad saw me on the street and gave me a lift in his car.
Matt: Well, at by the time you got to school, you were only five minutes late for class.