Q122 / 160 · AP EAMCET 2018 (22 Apr Shift 2) · Physics

Assertion (A) The angle between acceleration and velocity of a body is 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
    (A) is true but (R) is false.
  • Correct answer
    D
    (A) is false but (R) is true.

Solution

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 $\mathbf{a}$ and $\mathbf{v}$ may be $180^{\circ}$ or $0^{\circ}$. Reason is correct.

Hence, the correct answer is option: 'D'.

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