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Assertion A body with constant acceleration always moves along a straight line. Reason A body with constant magnitude of acceleration may not speed up.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Correct answer: Assertion is incorrect but Reason is correct

Solution

A constant acceleration vector does not force motion to be straight; for example, projectile motion has constant downward acceleration but a curved trajectory. A body with constant acceleration magnitude may fail to speed up if the acceleration is perpendicular to velocity, changing direction instead of speed.

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