Objects A and B are at the origin. If object A moves to (5 ,-7 ) and object B moves to (7 ,4 ) 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.

1 Answer
Apr 4, 2016

v_a=(5sqrt5)/3" m/s"

Explanation:

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"the green vector shows displacement of B from the perspective of A"

Delta s=sqrt(2^2+11^2)" (green vector)"
Delta s=sqrt(4+121)
Delta s=sqrt125
Delta s=5sqrt5" m"

v_a=(Delta s)/(Delta t)

v_a=(5sqrt5)/3" m/s"