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  • An objects falls from a bridge  above the water level in a river. It falls directly i

An objects falls from a bridge 45 \mathrm{~m} above the water level in a river. It falls directly into a boat moving with constant speed. The boat was 18 \mathrm{~m} away from the point of impact. What is the speed of the boat (in  \mathrm{m/s})

Option: 1

6


Option: 2

9


Option: 3

12


Option: 4

15


Answers (1)

best_answer

Time taken by the object to fall through 45 \mathrm{~m} is

t=\sqrt{\frac{2 h}{g}}=\sqrt{\frac{2 \alpha 45}{9.8}} \Rightarrow \sqrt{9.18} \approx 3 \mathrm{sec} .
 

If v is the speed of boat, then the distance travelled by boat in t=3 \mathrm{sec}  is

18 \mathrm{~m}=v \times 3 \mathrm{sec} \\
v=6 \mathrm{~m} / \mathrm{s}. 

Posted by

Deependra Verma

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