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A particle slides with a speed of 3m s^(...

A particle slides with a speed of `3m s^(-1)` at P. When it reaches `Q`,it acquires a speed of `4m s^(-1)` after describing an angle of `60^(@)` at `O` as shown in figure .Find the changes in the velocity of the particle between `P` and `Q`. Assume that the path followed by the particle is circular from `P` to `Q`

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