Question #117eb
1 Answer
(taking positive
Explanation:
Velocity is a vector quantity that describes both the magnitude and direction of the change in position of an object.
Since the speed is constant the only part of the velocity that changes is the direction.
We can calculate this change in velocity via components, taking the positive
When the truck was traveling north at a rate of
vecv_1 = overbrace(0hati)^(x"- component") + overbrace(20hatj)^(y"- component")
During the second part, when it was traveling west (also at
vecv_2 = -20hati + 0hatj
We can describe the change in velocity as the final value minus the initial value:
color(blue)(Deltavecv) = vecv_2 - vecv_1 = (-20hati + 0hatj) - (0hati + 20hatj) = color(blue)(ulbar(|stackrel(" ")(" "-20hati - 20hatj" ")|)
That is to say, the net change in horizontal velocity went down by magnitude