A particle is projected obliquely into a...

A particle is projected obliquely into air with velocity of 20 m/s at an angle of elevation of `45^@`. Neglecting air resistance the equation of motion is

`y=x/sqrt2 - gx/200`

`y=x[1/2- gx/400]`

`y=x[1-g/400]`

`y=x - gx^2/200`

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