Question

When an object undergoes acceleration :

(A)Its speed always increase (B)its velocity always increase (C)it always falls towards the earth (D)a force always acts on it

Answer 1

When an object undergoes acceleration:
then the velocity/ speed of an object can increase or decrease.
According Newton's Second Law, F=ma
If a  force acts on object then it accelerates.
hence option (D) A force always acts on it is the correct answer.

Answer 2

Answer:

a force always acts on it is correct because acceleration necessarily doesn't always cause an increase in speed or velocity. it can be retardation too. and acc to Newton's 2 Nd law of motion, F=ma

since mass can never be zero , if their is acceleration then only force acts on body otherwise if a =0 ,F=0

hence d is correct

Explanation:

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