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.

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Answer 1 · 2016-04-04T10:41:08

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

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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"#