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A helicopter of mass 1000kg rises with v...

A helicopter of mass `1000kg` rises with vertical acceleration of `15ms^(-2)`. The crew and passengers together weigh `300kg`. Give the magnitude and direction of
`(a)` force on floor by the crew and passengers.
`(b)` action on the rotor of the helicopter on the surrounding air.
`(c )` force on the helicopter due to the surrounding `(g=10Nms^(-2))`

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