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3 years ago

A train travels 120 km in 2 hours and 30 minutes. What is its average speed?

Physics

2 answers:

ivann1987 [24]3 years ago

5 0

Answer:

13.33 or 13 1/3m/s (meters per second)

Explanation:

In physics, we use the basic units of meters and seconds. So first convert (km) into meters (m) and also hours and minutes into seconds (s). We end up with 120000m and 9000s. Then divide the 120000m by the 9000s and you end up with 13.33 or 13 1/3 m/s.

USPshnik [31]3 years ago

5 0

Answer:

<em>The average speed of the train is 48 km/hr</em>

Explanation:

The term average speed refers to how fast a body is covering a distance. it is the rate at which a body covers a distance with time. Cars, Humans, and animals are among bodies that can attain speed. speed is measure in m/s.

<h3>Step by Step Calculation</h3>

speed of an object can be obtained using the equation below;

Speed = $\frac{Distance}{Time}$ ....................................1

from the question we are provided with;

Distance = 120 km

Time = 2 hours 30 minutes

Speed =?

The time can not operate with two units, so we have to convert 30 minutes to hours;

60 mins = 1 hr

30 mins = x hrs

x = $\frac{1 hr x 30 mins}{60 mins}$

x = 0.5 hours

now our time will be 2 hrs + 0.5 hr = 2.5 hrs

Substituting our values in equation 1 we have;

Speed = $\frac{120 km}{2.5 hrs}$

Speed = 48 km/hr

<em>Therefore, the average speed of the train is 48 km/hr</em>

<em />

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3 years ago

In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the

sp2606 [1]

<span>I'll tell you how to do it but you must crunch the numbers.

Use Kepler's 3rd Law

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a)
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3 years ago

1. What distance is required for a train to stop if its initial velocity is 23 m/s and its

Irina-Kira [14]

Answer:

x=?

dt=?

vi=23m/s

vf=0m/s (it stops)

d=0.25m/s^2

time =

vf=vi+d: 0=23m/s+(0.25m/s^2)t

t=92s

displacement=

vf^2=vi^2+2a(dx)

23^2=0^2+2(0.25m/s^2)x =-1058m

Explanation:

you can find time from vf = vi + a(Dt): 0 = 23 m/s + (0.25 m/s/s)t so t = 92 s and you can find the displacement from vf2 = vi2 + 2a(Dx) and find the answer in one step: 232 = 02 + 2(0.25 m/s/s)x so x = -1058 m

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3 years ago

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Daniel [21]

Answer:

b) 4781 N

Explanation:

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F =1700×2.8125=4781.25 N

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2 years ago

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frosja888 [35]

Answer:

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3 years ago

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