An aeroplane flies 400 m north and 300 m south and then flies 1200 m upwards then net displacerment is

Options

A. greater than `1200m`
B. less than 1200m
C. `1400m`
D. `1500m`

Answer

A

Explanation

(a): Aeroplane flies in space, so direction of movement is considered on X-, Y- and Z-axis .

`vecR=400 hatj-300 hatj+1200 hatk`
`100 hatj+1200hatk`
`R^(2)=(100)^(2)+(1200)^(2)`
`=100sqrt145m`
`R=1204.2m`
Thus, displacement is greater than 1200m