Idont understand physics at all!

a small two passenger airplane taxing to the runway at 4 m/s has a takeoff speed of almost 30 m/s or more than 65 mi/hr. determine the minimum length of the runway for the plane to reach that speed if it only takes 15 seconds to reach that speed. show your work.

Explanation:

Let be the distance of runway.

Let be the initial velocity of aeroplane.

Let be the initial velocity of aeroplane.

Let be the time taken by Susan.

Given,

From the given information we can assume that no additional forces are acting.So,the acceleration is constant.

The length of runway will be minimum if the aeroplane takes off in seconds.

As we know from the equations of motion,

So,

So,the minimum length of the runway required is

the correct choice is a .

do not post any more test or exam questions on

the answer is b, have negligible mass