As shown in fig. a metal ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is ……

Explanation

It is clear from the graph that displacement x is positive during motion. Ball is dropped from a height and its velocity increases in downward direction due to gravity field. In this condition v is negative but acceleration of the ball is equal to acceleration due to gravity i.e., a = -g. When ball rebounds in upward direction its velocity is positive but acceleration is a = - g. (a) The velocity-time graph of the ball is shown
in fig. (i).

(b) The acceleration-time graph of the ball is shown in fig. (ii).