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Q.

A truck travelling due north at 20 ms-1 turns west and travels with same speed. What is the change in velocity?

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a

202 ms-1 south-west

b

40 ms-1 south-west

c

202 ms-1 north-west

d

40 ms-1 north-west

answer is A.

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Detailed Solution

initial velocity 20j^ and final velocity 20(-i^)

change in velocity= ∆v→=-20i^-20j^

∆v→=202  

along south west 

 

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