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>

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For the following elementary reaction 2br• -> br2-. The rate of consumption of the reaction and the rate of formation of prod

Scorpion4ik [409]

Answer: $-\frac{1}{2}\times \frac{d[Br^.]}{dt}=+\frac{d[Br_2]}{dt}$

Explanation:

Rate of a reaction is defined as the rate of change of concentration per unit time.

Thus for reaction:

$2Br^.\rightarrow Br_2$

The rate in terms of reactants is given as negative as the concentration of reactants is decreasing with time whereas the rate in terms of products is given as positive as the concentration of products is increasing with time.

$Rate=-\frac{d[Br^.]}{2dt}$