搜搜做题作业网较短的英文物理问题~求高手进来解答~!
来源：学生作业帮 编辑：搜搜做题作业网作业帮 分类：英语作业 时间：2024/04/25 19:16:16
较短的英文物理问题~求高手进来解答~!
A hot-air balloon is rising straight up with a speed of 3.0m/s. A ballast bag is released from rest relative to the balloon when is is 9.5m above the ground. How much time elapses before the ballast bag hits the ground?
答案是 1.7s~求高手写过程怎么解答~!
A hot-air balloon is rising straight up with a speed of 3.0m/s. A ballast bag is released from rest relative to the balloon when is is 9.5m above the ground. How much time elapses before the ballast bag hits the ground?
答案是 1.7s~求高手写过程怎么解答~!
可以理解为一个物体在9.5M的高度以向上的初速度3.0m/s做自由落体运动.
t1=v/g=3/10=0.3s
S1=at1^2/2=0.45m
S=S1+S2=9.5+0.45=9.95m
t2=1.41
t=t1+t2=1.7
t1=v/g=3/10=0.3s
S1=at1^2/2=0.45m
S=S1+S2=9.5+0.45=9.95m
t2=1.41
t=t1+t2=1.7