Question

Objects A and B are at the origin. If object A moves to `(9 ,-7 )` and object B moves to `(-8 ,6 )` over `3 s`, what is the relative velocity of object B from the perspective of object A? Assume that all units are denominated in meters.

Answer 1

`v_"AB"=7,1" "m/s`
`alpha=143 ^o " from east"`

Explanation:

`Delta s=sqrt(17^2+13^2)" "Delta s=sqrt(289+169)`
`Delta s=21,4 " "m`
`v_"AB"=(Delta s)/(Delta t)`
`v_"AB"=(21,4)/3`
`v_"AB"=7,1" "m/s`
`tan (180-alpha)=13/17=37 ^o`
`alpha=180-37`
`alpha=143 ^o " from east"`