Q.

Fine the correct statement out of the following:(i) if acceleration = 0, motion is uniform.(ii) if acceleration = constant, acceleration is uniform but motion not.(iii) if acceleration ≠ constant, both acceleration and motion are not uniform.(iv) if acceleration = constant, both acceleration and motion are uniform.

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a

(i, ii, iii)

b

(ii, iii)

c

(i, iv)

d

(i, iii)

answer is A.

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Detailed Solution

Any non-zero acceleration (constant or variable) causes change in velocity i.e., non-uniform motion. When acceleration is zero, the velocity remains constant i.e., uniform motion.Hence option (iv) is incorrect.
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