A horizontal bridge is built across a river. A student standing o… - Vidyadip

MCQ

A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically downwards with a velocity $6 ms^{-1}$. The ball strikes the water surface after $2 s$. The height of bridge above water surface is (Take $g =10 m^{-2}$ ):

A
45 m
B
56 m
✓
32 m
D
64 m

✓

Answer

Correct option: C.

32 m

(C)
Let height of bridge $=h$
Displacement of ball, $S =- h$
$\begin{array}{l}S=ut+\frac{1}{2} a t^2 \\
-h=-6 \times 2+\frac{1}{2}(-10)(2)^2 \\
\Rightarrow h=32 m\end{array}$

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