Answer:
1020 km
Explanation:
A complete rotation of the wheel equals a distance of 1 circumference.
The circumference is
![C = \pi d](https://tex.z-dn.net/?f=C%20%3D%20%5Cpi%20d)
where <em>d</em> is the diameter of the wheel.
300,000 rotations = ![300000\pi d = 300000\times\pi\times1.08\text{ m} = 1017876.0\ldots\text{ m}](https://tex.z-dn.net/?f=300000%5Cpi%20d%20%3D%20300000%5Ctimes%5Cpi%5Ctimes1.08%5Ctext%7B%20m%7D%20%3D%201017876.0%5Cldots%5Ctext%7B%20m%7D)
In kilometers, this is = 1017876/1000 km = 1020 km
Answer: The train traveled 210 miles in 6 seconds of time duration.
Explanation:
The initial velocity of the train,u = 50 mile/s
Acceleration of the train ,a = ![-5.0 m/s^2](https://tex.z-dn.net/?f=-5.0%20m%2Fs%5E2)
Duration of time ,t = 6 seconds
Using second equation of motion :
![s=ut+\frac{1}{2}at^2](https://tex.z-dn.net/?f=s%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dat%5E2)
![s=50 mile/s\times 6 s+\frac{1}{2}(-5.0 m/s^2)(6s)^2=210 miles](https://tex.z-dn.net/?f=s%3D50%20mile%2Fs%5Ctimes%206%20s%2B%5Cfrac%7B1%7D%7B2%7D%28-5.0%20m%2Fs%5E2%29%286s%29%5E2%3D210%20miles)
The train traveled 210 miles in 6 seconds of time duration.
A: wave b. The others don't match.