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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.

Answer 1

Lily Adams

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

#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"#

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Answer 2

Sebastian Acosta

The relative velocity of object B from the perspective of object A is (1 m/s, 11 m/s).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.