Physics · Uniformly accelerated motion, velocity-time, position-time graph, relations for uniformly accelerated motion, relative velocity
Assertion A body with constant acceleration always moves along a straight line.
Assertion A body with constant acceleration always moves along a straight line. Reason A body with constant magnitude of acceleration may not speed up.
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
Assertion: Constant acceleration (vector) does not guarantee straight-line motion; if initial velocity has a component perpendicular to acceleration, the path is parabolic (e.g., projectile motion). Thus, assertion is false. Reason: Constant magnitude of acceleration can occur without change in speed (e.g., uniform circular motion), so the reason is true. Since assertion is false, the reason cannot explain it; option D is correct.
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