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Which of the following distance-time graphs shows a truck moving with a speed which is not constant?

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answer is C.

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Detailed Solution

Distance-time graph for a truck moving with a speed which is not constant is given by
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Suppose a vehicle is moving with uniform velocity. In that case, the distance covered by the vehicle is the same in an equal interval of time, whereas in a non-uniform motion, the distance covered is not the same.
We know

Speed = \frac{Distance}{Time}

Since the truck's motion is non-uniform, the distance-time graph is not a straight line. Hence, the truck moves at varying speeds.

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