Question

a car is moving along a straight track with a velocity of 20 metre per second after 5 second it starts retracing path with uniform velocity v if its average velocity after 15 seconds zero then v is​

Answer 1

Answer:

$\implies v=10$ m/s

Explanation:

$\text{Average velocity}=\frac{\text{Total displacement}}{\text{Total time}}$

Since the average velocity is zero

Therefore, the total displacement is zero

Therefore, the car returns in its original position

Thus,

Distance covered by the car with velocity 20 m/s in 5 seconds = Distance covered by the car with velocity v in 10 seconds

Using

$\text{Distance}=\text{Speed}\times\text{Time}$

$20\times 5=v\times 10$

$\implies v=10$ m/s

Hope this helps.

Answer 2

Hello

The answer is 10 m/s due West

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