Question

which are the situations in which the object undergoes acceleration​

Answer 1

Explanation:

When an object accelerates it's velocity changes, ie. Either it's speed changes (increases or decreases) or its direction changes(uniform circular motion) or both may occur at the same time.

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Answer 2

$\huge\green{Answer}$

(i) It's speed always increases

(ii) It's velocity always increases

(iii) It always falls towards the earth

(iv) A force always acts on it