Question

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

Easy

Solution

initial velocity 20 $\hat{j}$ and final velocity 20( $- \hat{i}$ )
change in velocity= $∆ \overset{⇀}{v} =$ -20 $\hat{i}$ --20 $\hat{j}$
$|∆ \overset{⇀}{v}| = 20 \sqrt{2}$
along south west

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