Ahigh-speed bullet train accelerates and decelerates at the rate of 10 ft/s2. its maximum cruising speed

6 answers
Question:

Ahigh-speed bullet train accelerates and decelerates at the rate of 10 ft/s2. its maximum cruising speed is 120 mi/h. (round your answers to three decimal places.) (a) what is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising speed and then runs at that speed for 15 minutes?

Answers

What is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising speed and then runs at that speed for 15 minutes?

d = vo*t + 0.5*a*(t**2)  (vo= initial speed = 0; a= acceleration; t=time, d = distance)

Vf  = vo  + a*t      (final speed, in this case it will be the cruising speed)

Since vo = 0 (starts from rest)

t = Vf/a

d = 0 + 0.5*a*((Vf/a)**2)

d =  (0.5/a)*(Vf)**2

a = 24545 miles/h2 = 10ft/s2

d1 =  (0.5/24545 miles/h2)*(120 mi/h)**2 = 0.293 miles

From cruising speed, distance traveled after 15 minutes (0.25h)

v = d/t > d2 =v*t = 120 mi/h (0.25h) = 30 miles

Maximum distance the train can travel,

D = d1 + d2 = 0.293 + 30  miles = 30.293 miles

105,600 feet per hour

Step-by-step explanation:

1 mile = 5,280 feet

5,280 feet x 20 miles = 105,600 feet

Hope I helped!

105600

Step-by-step explanation:

I don't understand I am only in kindergarten. I am just kidding LOLOLOLOLOLOLOL

the answer is c. 1.1 seconds.

hope this : )

It's simple enough. i'll give you some equations of motion for acceleration that is constant.  . we know s, and u, and a. so we put the right numbers into equation. we get:   . simplify that and get  . so the only one we don't know is t and then your turn.

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