较短的英文物理问题~求高手进来解答~!
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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~!
![较短的英文物理问题~求高手进来解答~!](/uploads/image/z/5234569-25-9.jpg?t=%E8%BE%83%E7%9F%AD%E7%9A%84%E8%8B%B1%E6%96%87%E7%89%A9%E7%90%86%E9%97%AE%E9%A2%98%7E%E6%B1%82%E9%AB%98%E6%89%8B%E8%BF%9B%E6%9D%A5%E8%A7%A3%E7%AD%94%7E%21)
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