Airdrop of ax ore pool

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2. < Table > < tbody > < tr > < td > solution: get a (01000), C (200840) from the meaning of the title. < br > let the expression of parabola be y = ax < sup > 2 < / sup > + 1000, < br > substitute C (200840), < br > get 840 = 200 < sup > 2 < / sup > · a + 1000, < br > get , < br > get x < sub > 1 < / sub > = 500, x < sub > 2 < / sub > = - 500 (rounding off),
So the horizontal distance OP from the plane to P should be 500m. < / td > < / TR > < / tbody > < / Table >