Question

A plane must reach a speed of 72m/s to take off. If it starts from rest, and can accelerate at 7.2m/s², how long will it be on the runway before it can take off?

Answer 1

The plane will be on the runway for 10 seconds before it can take off.

Step-by-step explanation:

To determine how long the plane will be on the runway before it can take off, we need to calculate the time it takes for the plane to reach a speed of 72 m/s. We can use the equation:

final velocity = initial velocity + (acceleration * time)

Since the plane starts from rest, the initial velocity is 0. Rearranging the equation, we get:

time = (final velocity - initial velocity) / acceleration

Substituting the given values, we have:

time = (72 m/s - 0 m/s) / 7.2 m/s²

time = 10 seconds