Physics, asked by jyothsnakalluri, 21 days ago

9. A car travels a certain distance at a speed of 50 km/h and returns at a speed of 40 km/h. Calculate the average speed for the whole journey.
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Answers

Answered by artikeshawani
0

Answer:

YOU SHOULD 2 OPTIONS

1. IN PIC

2.average speed-here the distances are equal,we have the formula of finding average speed when distance is equal as V1*V2/V1+V2. if we substitute the values here we get 50*40/50+40 which gives 200/90=20/9 kmph which when converted into m/s gives 8

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Answered by Itzheartcracer
0

Given :-

A car travels a certain distance at a speed of 50 km/h and returns at a speed of 40 km/h.

To Find :-

Average speed for the whole journey.

Solution :-

Let the distance be x

Total distance = x + x = 2x km

Total time taken

Time in first case = Distance/Speed

Time in first case = x/50

Time in second case =  Distance/Speed

Time in second case = x/40

Avg. speed = Total distance/Total time

Avg. speed = 2x/(x/50 + x/40)

Avg. speed = 2x/(4x + 5x/200)

Avg. speed = 2x/(9x/200)

Avg. speed = 2x/9x × 200

Avg. speed = 2/9 × 200

Avg. speed = 400/9 km/h

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