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A projectile is given an initial velocity of ) j ˆ 2 i ˆ ( + m/s, where i ˆ is along the ground and j ˆ is along the vertical. If g = 10 m/s 2 , the equation of its trajectory is -

1. 4y = 2x – 5x 2
2. 4y = 2x – 25x 2
3. y = x – 5x 2
4. y = 2x – 5x 2

Correct answer: y = 2x – 5x 2

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