change is final minus initial:
-80 - 50 = -130 km/hr
A car initially moves along a straight road at 50 km/hr, and then turns around to travel at 80 km/hr in the opposite direction. What is the car’s change of velocity?
2 answers
Your answer: 130 km/hr
The change in velocity is the final velocity minus the initial velocity which in this case is adding the 80 km/hr arrow to the negative of the 50 km/hr arrow. This makes both the arrows point in the same direction, so the magnitudes are added together to account for the change in the car’s velocity.
The change in velocity is the final velocity minus the initial velocity which in this case is adding the 80 km/hr arrow to the negative of the 50 km/hr arrow. This makes both the arrows point in the same direction, so the magnitudes are added together to account for the change in the car’s velocity.