A) \[10\text{ }m/sec\]
B) \[20\text{ }m/sec\]
C) \[\text{15 }m/sec\]
D) \[zero\]
Correct Answer: A
Solution :
We should know the displacement in this time. \[\text{=}\overrightarrow{\text{u}}\text{t+}\frac{\text{1}}{\text{2}}\overrightarrow{\text{a}}{{\text{t}}^{\text{2}}}\](We take upward as positive) \[S=30\times 4-10\times 4\times \frac{4}{2}=40\text{ m}\text{.}\] The average velocity will be \[10\text{ }m/sec\].
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