Question

State which of the following situations are possible and give an example for each of these:​
(a) an object with a constant acceleration but with zero velocity.​
(b) an object moving with an acceleration but with uniform speed.​

Answer 1

(a) When a ball is thrown vertically up, at maximum height it has zero velocity, although it will have constant acceleration due to gravity, which is $9.8m/s^2$.​
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This is an instance of constant acceleration but zero velocity​

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(b)​ When an object moves in a uniform circular motion, it has an acceleration, which is perpendicular to its direction of motion at each instant, also, the speed remains uniform.​