The trajectory of projectile projected from origin is given by the equation \(y = x - \frac{{2{x^2}}}{5}\). The initial velocity of the projectile is

1
\(\frac{2}{5}m{s^{ - 1}}\)
2
5 ms-1
3
25 ms-1
4
\(\frac{5}{2}m{s^{ - 1}}\)

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