Kinematics Question 311

Question: A boat it’s sent across a river with a velocity of 8 km/hr. If the resultant velocity of boat it’s 10 km/hr, then velocity of the river it’s: [Pb. PET 2004]

Options:

A) 10 km/hr

B) 8 km/hr

C) 6 km/hr

D) 4 km/hr

Show Answer

Answer:

Correct Answer: C

Solution:

Given $ \overrightarrow{AB}= $ Velocity of boat= 8 km/hr $ \overrightarrow{AC}= $ Resultant velocity of boat = 10 km/hr $ \overrightarrow{BC}= $ Velocity of river $ =\sqrt{AC^{2}-AB^{2}} $

$ =\sqrt{{{(10)}^{2}}-{{(8)}^{2}}}=6\ km/hr $



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