Question

Assertion (A): The angle between acceleration and velocity of a body in one dimensional motion is always zero.
Reason (R): One dimensional motion is along a straight line.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. Both (A) and (R) are true but (R) is not the correct explanation of (A)
• C. is true but (R) is false
• D. is false but (R) is true

Answer 1

Answer: (D)

Assertion is incorrect as during decceleration, i.e. when body is slowing down, acceleration and velocity are directed opposite to each other. Hence, angle between $a$ and $v$ may be $180^{\circ}$ or $0^{\circ}$. Reason is correct.