Question

3.Explain uniform and non uniform acceleration by Velocity-time graph.
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Answer 1

Answer:

If the graph forms a straight line with a constant slope, then the motion is uniform, and the slope of the graph is equal to the velocity of the object. If an object exhibits non-uniform motion, a position-time graph of the motion will be curved, not straight.

Explanation:

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Answer 2

ANSWER
slope of velocity time graph gives acceleration.
here slope of the graph is constant but negative, so body is under retardation. also it has some initial velocity equal to v.
so D option is correct.