A) \[\frac{10}{\sqrt{3}}\]
B) \[10\sqrt{3}\]
C) \[\frac{5}{\sqrt{3}}\]
D) \[5\sqrt{3}\]
Correct Answer: A
Solution :
: Let \[\upsilon \] be the velocity of the projectile at P when it makes an angle \[{{30}^{o}}\] with the horizontal. Then \[\upsilon \,\cos {{30}^{o}}=u\cos {{60}^{o}}=10\times \frac{1}{2}=5\] \[\upsilon =\frac{5}{\cos {{30}^{o}}}=\frac{5}{(\sqrt{3}/2)}=\frac{10}{\sqrt{3}}m\,{{s}^{-1}}\]You need to login to perform this action.
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