Objects A and B are at the origin. If object A moves to $(-2 ,7 )$ and object B moves to $(5 ,3 )$ over $4 s$ , what is the relative velocity of object B from the perspective of object A?

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Answer 1 · 2016-03-03T10:42:05

$((7/4) , (-1)) "unit/s"$

After $4 "s"$ , $A$ observes that $B$ is at

$5 - (-2) = 7$

7 units in the positive $x$ direction and

$3 - 7 = -4$

4 units in the negative $y$ direction relative to itself.

The $x$ component of the velocity of $B$ relative to $A$ is $7/4 "unit/s"$

The $y$ component of the velocity of $B$ relative to $A$ is $-1 "unit/s"$

Objects A and B are at the origin. If object A moves to (-2 ,7 )(-2 ,7 ) and object B moves to (5 ,3 )(5 ,3 ) over 4 s4 s, what is the relative velocity of object B from the perspective of object A?