Range of Projectile

An object of mass $1$ kg is thrown into the air at an angle of $60^{\circ}$ above the horizontal direction, and with a speed of $20$ m / s. Its position at any time is described by the point $P(x, y)$ . For $15 \le x \le 25$ , the object is subject to an upward force of $10$ N, thus cancelling the effect of gravity, and making the net force on the object zero, (it is assumed that $g = 10 m / s^2$ ). Find the range of this projectile, that is, the maximum value of $x$ in its trajectory until it hits the ground. If the range is $R$ then enter $\lfloor 100 R \rfloor$ as your answer. Note: Ignore air resistance.

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