NEET Physics (general) MCQ Question
Consider the following statements about motion in a straight line: 1. The origin and the positive direction of an axis can be chosen arbitrarily. 2. Acceleration always indicates an increase in speed. 3. If a particle is moving with decreasing speed, its acceleration is opposite to its velocity. 4. The sign of acceleration directly indicates whether the particle's speed is increasing or decreasing. Which combination of statements is correct?
1 and 3
2 and 4
1 and 2
3 and 4
Correct Answer
Detailed Explanation
Statement 1 is correct as the choice of origin and direction is arbitrary. Statement 3 is also correct, as it reflects that acceleration in the opposite direction indicates a decrease in speed. Statements 2 and 4 are incorrect as they misinterpret the relationship between acceleration and speed.
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