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  • A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity <img alt="\mathrm{4\, ms^{-1}}" src="https://entrancecorner.onco

A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity \mathrm{4\, ms^{-1}}. The ball strikes the water surface after 4s. The height of bridge above water surface is \left(\text { Take } g=10 \mathrm{~ms}^{-2}\right):

Option: 1

\mathrm{56\, m}


Option: 2

\mathrm{60\, m}


Option: 3

\mathrm{64\, m}


Option: 4

\mathrm{68\, m}


Answers (1)

best_answer

-\mathrm{h}=\mathrm{ut}-\frac{1}{2} \mathrm{gt}^2 \quad \Rightarrow \quad-\mathrm{h}=4 \times 4-\frac{1}{2} \times 10 \times 16 \quad \Rightarrow \quad h=64 \mathrm{~m}

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Pankaj

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