Q 11-03-012NEETAIPMT 2011Easy
A missile is fired for maximum range with an initial velocity of $20\ \text{m s}^{-1}$. The range of the missile is ($g = 10\ \text{m/s}^2$)
Answer: (D) $40$ m
Concept. Maximum range is at $45°$: $R_{\max} = \dfrac{u^2}{g}$.
Step 1. Substitute. $\dfrac{400}{10} = 40$ m.
Answer. $40$ m (Option D).
Solution by Sreeraj P, M.Sc Physics