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IIT JEE Advanced 2007 Paper 1

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Question : 6

Total: 66

Two particles of mass m each are tied at the ends of a light string of length 2a. The whole system is kept on a frictionless horizontal surface with the string held tight so that each mass is at a distance a from the centre P (as shown in the figure). Now, the midpoint of the string is pulled vertically upwards with a small but constant force F. As a result, the particles move towards each other on the surface. The magnitude of acceleration, when the separation between them becomes 2x, is

F
2m
a
√a2−x2
F
2m
x
√a2−x2
F
2m
x
a
F
2m
√a2−x2
x

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