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Q.

One of the rectangular components of velocity of 80 kmh-1 is 40 Kmh-1 What are the other components ?

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a

69.28 kmh-1

b

40 kmh-1

c

120 kmh-1

d

89.44 kmh-1

answer is B.

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Detailed Solution

R = 80 km/h, Rx = 40 km/h

but R2 = Rx2+Ry2   ⇒802 = 402+Ry2

⇒  Ry2 = 4800

⇒Ry = 4800 = 403 = 69.28

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