A stone of mass 500g is dropped from the...

A stone of mass 500g is dropped from the top of a tower of 100m height. Simultaneously another stone of mass 1 kg is thrown horizontally with a speed of `10 m s^(-1)` from same point. The height of the centre of mass of the above two stone system after 3 sec is `( g = 10 m s^(-2)`)

45 m

35 m

55 m

none of these

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