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?
change is final minus initial:
-80 - 50 = -130 km/hr
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.
To determine the car's change in velocity, we need to find the difference between its initial velocity and final velocity.
Given that the car initially moves at 50 km/hr and then turns around to travel at 80 km/hr in the opposite direction, we can calculate the change in velocity.
The difference between the initial velocity and the final velocity is obtained by subtracting the initial velocity from the final velocity.
Therefore, the change in velocity is:
Change in velocity = Final velocity - Initial velocity
Let's substitute the values:
Change in velocity = 80 km/hr - 50 km/hr
Calculating this, we get:
Change in velocity = 30 km/hr
Hence, the car's change in velocity is 30 km/hr.