Practice question
Question
A boat moves north at 20 km/h while a river current flows east at 15 km/h. What is the magnitude of the resultant velocity?
Explanation
Resultant velocity R = √(v\_x² + v\_y²). As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 25 km/h as the result, so option B is correct.
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