Question

A car travles 20 m in 1 second next 50 m in 7 seconds and lastly 30 m in 2 seconds . Find the average speed of the car

Answer 1

Given :

▪ A car travels 20m in 1sec, next 50m in 7sec and last 30m in 2sec.

To Find :

▪ Average speed of car.

Concept :

➡ Average speed is defined as the ratio of total distance travelled to the time taken.

➡ It is a scalar quantity.

➡ It can't be negative or zero.

➡ It has only magnitude.

➡ SI unit : m/s

Calculation :

$\dashrightarrow\sf\:V_{av}=\dfrac{Distance\:travelled}{Time\:taken}\\ \\ \dashrightarrow\sf\:V_{av}=\dfrac{d_1+d_2+d_3}{t_1+t_2+t_3}\\ \\ \dashrightarrow\sf\:V_{av}=\dfrac{20+50+30}{1+7+2}\\ \\ \dashrightarrow\sf\:V_{av}=\dfrac{100}{10}\\ \\ \dashrightarrow\underline{\boxed{\bf{\blue{V_{av}=10\:ms^{-1}}}}}\:\orange{\bigstar}$

Answer 2

$\huge{\pink{\underline{\underline{Question}}}}$

A car travels 20 metres in 1 second next 50 metres in 7 seconds and lastly 30 metres in 2seconds find the average speed of the car .

$\huge{\purple{\underline{\underline{\Answer}}}}$

Given,

➡️A car travels 20m in 1 sec

➡️The same car travels 50m in 7sec

➡️And lastly 30m in 2 sec

We know that,

$v = \frac{distance \: travelled}{time \: taken}$

$v = \frac{ d{1} + d2 + d3 }{t1 + t2 + t3}$

$v = \frac{20 + 50 + 30}{1 + 7 + 2}$

$v = \frac{100}{10}$

$v = {10ms}^{ - 1}$

The average speed of the car is 10ms^-1.

Additional information:-

Average speed:-

• average speed is calculated by dividing the total distance that something has travelled by the total amount of time it took it to travel the distance .

• Average speed is the total distance divided by the total time taken.

• The units of Average speed is m/s.

• V(av) denotes the average speed.

• Average speed is defined only by magnitude.

• Average speed is a scalar quantity.

• Average speed measures the rate of speed over the extent of a trip.