A helicopter of mass 2000 kg rises with a vertical acceleration of 15 $m s^{- 2}$ . The total mass of the crew and passengers is 500 kg. Choose the correct statement from the following. (Take g=10 $m s^{- 1}$ )
(i) The force on the floor of the helicopter by the crew and passengers is $1.25 \times 10^{4} N$ vertically downwards.
(ii) The action of the rotor of the helicopter on the surrounding air is $6.25 \times 10^{4}$ vertically downwards.
(iii) The force the helicopter due to the surrounding air is $6.25 \times 10^{4} N$ vertically upwards.

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