A glaucous-winged gull,ascending straight upward at 5.20m/s,drops a shell when it is 12.5m above the ground.a) What is t
问题描述：
A glaucous-winged gull,ascending straight upward at 5.20m/s,drops a shell when it is 12.5m above the ground.a) What is the magnitude and direction of the shell's acceleration just after it is released?b) Find the maximum height above the ground reached by the shell.c) How long does it take for the shell to reach the ground?d) What is the speed of the shell at this time?
a) 9.81m/s^2
b) 13.9m
C) 2.21s
d) 16.5m/s
答
一只鸟以5.2m/s的速度垂直向上飞,在12.5m的高度丢了一个贝壳下来a.贝壳刚被丢下来的时候的加速度大小和方向b.贝壳到达的最高高度c.贝壳用多久落地d.贝壳落地时的速度a.就是重力加速度.9.81m/s^2,垂直向下b.贝壳被丢...