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A pendulum has a ball of mass m attached...

A pendulum has a ball of mass m attached to the stringa and is suspended from the roof of a trolley. If the trolley rolls upwards with acceleration a, then what is the angle made by the string with the inclined plane? (Given that, `a=5m//s^(2), g=10m//s^(2)` and the angle of inclination of the plane is `30^(@)`)

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