Question

car travels on straight road, it covers half distance with a speed of 80km/h and remaining half with a speed of 120km/h. Find average velocity?car travels on straight road, it covers half distance with a speed of 80km/h and remaining half with a speed of 120km/h. Find average velocity?car travels on straight road, it covers half distance with a speed of 80km/h and remaining half with a speed of 120km/h. Find average velocity?car travels on straight road, it covers half distance with a speed of 80km/h and remaining half with a speed of 120km/h. Find average velocity?​

Answer 1

AnswEr :

• Average speed is 100km/h.

Given :

• At the first half time, speed of car is 80 km/h.

• Distance(D1) = 80 km × t

• For the second half, speed of car is 120km/h.

• Distance (D2) = 120 km × t

To Find :

• Average velocity(Vavg) = ?

Solution :

Let the time required by each half be t.

★ Total distance covered :

➝ D = D1 + D2

➝ D = 80t + 120t

➝ D = 200t km

★ Total time taken :

➝ T = 2t (As each half's distance is t)

So,

★ Average speed :

➝ Vavg = Total distance /Time taken

➝ Vavg = D / t

➝ Vavg = 200t / 2t

➝ Vavg = 100 km/h

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$\dag \ { \large{ \underline{ \underline{ \sf{ \purple{Additional \ Information : - }}}}}}$

• The speed of an object or body is the magnitude itself of the change of its position .

• Average speed is measured in miles per hour or kilometers per hour .

• Average speed is mainly applied to vehicles like trains, cars , etc.

• It is a Scalar quantity.

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