A) \[{{30}^{o}}\]
B) \[{{45}^{o}}\]
C) \[{{50.2}^{o}}\]
D) \[{{60}^{o}}\]
Correct Answer: A
Solution :
[a] For vertical upward motion \[h=ut-\frac{1}{2}g{{t}^{2}}\] \[5=(25\sin \theta )\times 2-\frac{1}{2}\times 10\times {{(2)}^{2}}\] \[\Rightarrow 25=50\,\sin \theta \Rightarrow \sin \theta =\frac{1}{2}\Rightarrow \theta =30{}^\circ \]
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