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A missile is fired for maximum range with an initial velocity of $20 m/s$. If $g = 10 m/s^{2}$, the range of the missile is
Explanation
For maximum range, the angle of projection, $\theta = 45^{\circ}$ $\therefore R = u^{2}\sin 2\theta/g = (20)^{2}\sin(2 \times 45^{\circ})/10 = (400 \times 1)/10 = 40 m$.