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A truck travelling due north at 50 kn/hr turns west and travels at the same speed. What is the change in velocity?
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let line joining east-west is x axis & north -south is y axis ...
initial velocity = 50j (towards north)
final velocity = 50(-i) (towards west)
change in velocity = initial - final = 50(i+j)
magnitude = 50root2 = 70.5
50*sqrt(2) km*(hr^-2) towards south-west.
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