math 一問
2009-01-01 9:13 pm
Launch a water rocket into the sky, and theinitial speed of the rocket is 70 m/s. It is known that the relation between the initial speed (U m/s), the time (T s) and the speed afterwards (V m/s) can be expressed by the formula V=U-9.8T . Use this formula to estimate the speed of the rocket after 6 s.
回答 (2)
2009-01-01 10:28 pm
✔ 最佳答案
V=U-9.8Tsub V=70 and T=6 ,then we have
V=70-9.8*6=11.2 m/s//
2009-01-01 10:28 pm
The initial speed of the rocket is 70 m/s
So U=70 and V=70-9.8T
The speed of the rocket after 6 s
=70-9.8*6
=11.2 m/s
So U=70 and V=70-9.8T
The speed of the rocket after 6 s
=70-9.8*6
=11.2 m/s
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