Question

A train is running at a speed of 84km/hr crosses an electric pole in 9 sec. The length of the train is.


I need answer with solution
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Answer 1

speed of train=84km/h

84km/h×5/18m/s=23.33m/s

now use the formula

speed of train=length of train/time

Answer 2

Answer:

Step-by-step explanation:

ANSWER:-

Given that:-

• A train running at a speed of 84 km/h
• The train crosses a electric pole at 9 seconds
• We need to find the length of the train.

Let's Do!

What we can do here, is first convert the given units into SI units.

84 km/h => m/s

1 metre = 1000 km

1 hour = 3600 seconds

$\sf{Kmph = \dfrac{1000}{3600} = \dfrac{5}{18} \ After \ simplification}$

So, we can now multiply 84 with 5/18

It was just a shortcut method, you can use it directly as well.

So, we get:-

$\sf{\dfrac{84 \times 5}{18}}$

$\sf{ = 23.33 \ mps \ approximately}$

mps means metre/second.

Now, we know that

$\boxed{\sf{Speed = \dfrac{Distance}{Time} }}$

$\boxed{\sf{\mapsto Distance = Speed \times Time}}$

Now, we need is length ie Distance.

So, 23.33*9 = 209.97 metres is the length of the train.