Physics
Assertion (A) : The acceleration-time graph of а body is a straight line parallel to time axis.
Reason (R) : This depicts the motion of freely falling body under gravity.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Motion in One Dimension
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Answer
both A and R are true and R is the correct explanation of A
Explanation
Assertion (A) is true because if a body moves with constant acceleration, the acceleration-time graph is indeed a straight horizontal line parallel to the time axis.
Reason (R) is true because for a freely falling body under gravity (ignoring air resistance), the acceleration is constant and equal to g (= 9.8 m/s²) and this produces a horizontal acceleration-time graph so the reason correctly explains the assertion.
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