Question

multiple choice question. an airplane flies along a straight line, in the direction of what we will define as the positive x - axis of a coordinate system. let the velocity in this direction be considered a positive velocity. if the airplane speeds up from 640 km/h to 800 km/h, its acceleration equals its change in velocity divided by the time interval over which the change occurs. the change in velocity is given by _____. 640 km/h + 800 km/h; 800 km/h + 640 km/h; 800 km/h - 640 km/h; 640 km/h - 800 km/h

Explanation:

Step1: Recall the formula for change in velocity

Change in velocity $\Delta v=v - u$, where $v$ is the final velocity and $u$ is the initial velocity.

Step2: Identify initial and final velocities

The initial velocity $u = 640$ km/h and the final velocity $v=800$ km/h.

Step3: Calculate change in velocity

$\Delta v=800 - 640$ km/h

Answer:

C. $800$ km/h - $640$ km/h