$A$ missile is fired for maximum range at your town from a place $100\, km$ away from you. If the missile is fired for maximum range,what is the maximum height reached by the missile? (Take $g = 10\, m/s^2$)
- A$2.5\times10^4\, m$
- B$5.0\times10^4\, m$
- C$7.5\times10^4\, m$
- D$10^5\, m$
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