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Q.
An aeroplane flies $400\, m$ north and $300\, m$ south and then flies $1200\, m$ upwards, then net displacement is:
Motion in a Straight Line
Solution:
An aeroplane flies $400 m$ north and $300 m$ south so let aeroplane starts there journey from point $O$
Net displacement of the plane is $100 m,$ after it flies $1200 m$ upward; so the displacement or position is
$\overrightarrow{\mathrm{r}}=100 \hat{\mathrm{i}}+1200 \hat{\mathrm{j}}$
Magnitude of displacement $=\mathrm{r}=\sqrt{(100)^{2}+(1200)^{2}}$
$\mathrm{r}=\sqrt{10000+1440000}$
$=1204 \mathrm{~m}$
