Question

A car has travelled a distance of 210 m in 6 seconds. Calculate the speed. Give your answer in kilometer per hour

Answer 1

Answer:

The required speed is 126 kmph.

Explanation:

Given :

A car has travelled a distance of 210 m in 6 seconds.

To find :

the speed

Solution :

We know,

Speed = Distance covered/time taken

We're given the distance covered and time taken. Substitute the values,

Speed = 210/6

Speed = 35 m/s

• 1 km = 1000 m

        ⇒ 1 m = 1/1000 km

• 1 hr = 3600 s

        ⇒ 1 sec = 1/3600 hr

∴ 1 m/s = 3600/1000 kmph

        = 18/5 kmph

Now,

$\sf 35 \ m/s=35 \times \dfrac{18}{5} kmph\\\\ \implies \sf 35 \ m/s=7 \times 18 \ kmph \\\\ \implies \sf 35 \ m/s=126 \ kmph$

Hence, the required speed is 126 kmph

Answer 2

Answer:-

• Distance=210m
• Time=6s

We know that

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

$\\ \sf\longmapsto Speed=\dfrac{210}{6}$

$\\ \sf\longmapsto Speed=35m/s$

Converting to km/h

$\\ \sf\longmapsto 35\times \dfrac{18}{5}$

$\\ \sf\longmapsto 126km/h$