Question

aa train running at the speed 60/hr crosses a pole in 9 sec what is the length of the train​

Answer 1

Answer:

150 meter

145 meter

140 meter

135 meter

Answer: Option A

Explanation:

Speed = 60*(5/18) m/sec = 50/3 m/sec

Length of Train(Distance) = Speed * Time

\begin{aligned}

= \frac{50}{3}*9 = 150 meter

\end{aligned}

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.