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Q.

A light spring is compressed and placed horizontally between a vertical fixed wall and a toy car, free to slide over a smooth horizontal table [fig. (14)1. If the system  

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is released from rest which of the following graphs [fig. (15)] represents the relation between acceleration (a) and distance (x) covered by the car ?
 

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a

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b

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c

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d

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answer is B.

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Detailed Solution

 Till the spring acquiesce its natural length, acceleration decreases linearly. After this, the car moves with constant velocity. This is represented by graph (b).

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