(i) Can a body have zero velocity and finite acceleration? Explain with example.

(ii) Can a body have constant speed but varying velocity?

i) Yes. When a ball is thrown vetrically upwards, then at the topmost point it has zero velocity but acceleration is non-zero and is equal to g = 9.8 m/s.  

ii) Yes a body can have constant speed but varying velocity. A good example is uniform circular motion, where magnitude of velocity (= speed) remains contant but the direction of velocity changes at each point on its trajactory.

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