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A racing car accelerates uniformly at $4 m s − 2$ . When it first starts, how far will it travel in 10 seconds?

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200 m

80 m

400 m

40 m

answer is A.

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Detailed Solution

Concept: The rate of Change of velocity is called acceleration.
Final acceleration,

Time period,

The car has uniform acceleration. This means that initially, it was at rest. Thus, Initial velocity,

Formula used
As per the second equation of motion,

, where

is the distance covered.
Calculate the distance covered
Substituting the values in the above equation,

Therefore, the car will cover a distance of

after the start.
Hence, the correct option is 1.

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