Asmall airplane has to reach a speed if 27.8 m/s to takeoff. it can accelerate at 2.00 m/s^2. what is the minimal length of runway that would allow for a safe takeoff?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

What is the temperature in degrees celsius of a substance with a tempature of 49k