A) \[30\,\,m{{s}^{-1}}\]
B) \[10\,\,m{{s}^{-1}}\]
C) \[40\text{ }m{{s}^{-1}}\]
D) \[20\,\,m{{s}^{-1}}\]
Correct Answer: D
Solution :
Since the ball is thrown upwards and it reaches back, so time to reach maximum height is half of total time \[i.e.,\,\,{{t}_{\text{maximum}}}=2\sec .\] Also speed at maximum height is zero, so \[0=u-g{{t}_{\max }}\]
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