1.

A particle moves in a plane with a constant speed along a path `y=2x^(2)+3x-4` When the particle is at (0,-4) the direction along which it is moving is inclined to the X axis at an angle. Given `tan^(-2) 3=72^(@)`A. `63^(@)`B. `72^(@)`C. `27^(@)`D. `0^(@)`

Answer» Correct Answer - B
`(dy)/(dx)=4x+3=3("at" x=0)`
`:. tan theta =3" "0 =72^(@)`


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