An airplane starts at rest and accelerates down the runway for 20s. At he end of the runway, it's velocity is 80 m/a north. What is its acceleration?
a =v/t
a = 80/20 = 4 m/sec/sec north
20s 80 m/s
To find the acceleration of the airplane, we can use the equation of motion:
velocity = initial velocity + acceleration * time
In this case, the initial velocity is 0 m/s (since the airplane starts at rest), the final velocity is 80 m/s, and the time is 20 seconds.
Plugging these values into the equation, we have:
80 m/s = 0 m/s + acceleration * 20 s
To isolate the acceleration, we can rearrange the equation:
acceleration = (80 m/s - 0 m/s) / 20 s
Simplifying the expression:
acceleration = 80 m/s / 20 s
Finally, we calculate the acceleration:
acceleration = 4 m/s²
Therefore, the airplane's acceleration is 4 m/s² north.