A body moves due East with velocity 20, km/hour and then due North with velocity 15 ,km/hour . resul

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3-1.Vectors

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A body moves due East with velocity $20\, km/hour$ and then due North with velocity $15 \,km/hour$. The resultant velocity..........$km/hour$

A

$5$

B

$15$

C

$20$

D

$25$

Solution

(d) Resultant velocity${\rm{ }} = {\rm{ }}\sqrt {{\rm{2}}{{\rm{0}}^{\rm{2}}} + {{15}^2}} $

= $\sqrt {400 + 225} = \sqrt {625} = 25\;km/hr$

Standard 11

Physics

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