A truck travelling due north at $20 \mathrm{~m} / \mathrm{s}$ turns west and travels at the same spe

Question

A truck travelling due north at $20 \mathrm{~m} / \mathrm{s}$ turns west and travels at the same speed. The change in its velocity is\

Professor PC Thomas Classes · Answer

To find the change of velocity we must subtract initial velocity ( $20 \mathrm{~m} / \mathrm{s}$ north) from final velocity ( $20 \mathrm{~m} / \mathrm{s}$ west). For this we have\ to reverse the initial velocity and take the vector sum. In the figure.\ $\mathrm{AC}^{2}+\mathrm{AB}^{2}+\mathrm{BC}^{2}=20^{2}+(-20)^{2}$\ $A C=20 \sqrt{2}$ south west\