A) \[30\text{ m}\,\,{{\text{s}}^{-1}}\]
B) \[50\text{ m}\,\,{{\text{s}}^{-1}}\]
C) \[40\text{ m}\,\,{{\text{s}}^{-1}}\]
D) \[45\text{ m}\,\,{{\text{s}}^{-1}}\]
Correct Answer: B
Solution :
[b] As we know, \[\text{R = u cos}\theta \times \text{t}\] \[\text{Given, R}\,\,\text{=}\,\,\text{300}\,\text{m, t}\,\,\text{=}\,\,\text{6s}\] \[\therefore \,\,\text{u cos}\theta \,\text{=}\,\,\frac{\text{R}}{\text{t}}=\frac{300}{6}=50\text{ m}{{\text{s}}^{-1}}\]
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