A) \[\frac{1}{2}s\]
B) \[\frac{1}{3}s\]
C) \[\frac{1}{4}s\]
D) \[1\,s\]
Correct Answer: B
Solution :
[b] Components of velocity of ball relative to lift are: \[{{v}_{x}}=4\cos 30{}^\circ =2\sqrt{3}m/s\] \[{{v}_{y}}=4sin30{}^\circ =2m/s\] and acceleration of ball relative to lift is \[12\text{ }m/{{s}^{2}}\]in negative y-direction or vertically downwards. Hence time of flight \[T=\frac{2{{u}_{y}}}{12}=\frac{{{u}_{y}}}{6}=\frac{2}{6}=\frac{1}{3}s\]You need to login to perform this action.
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