does anyone know?

Question

1.) What are the mathematical signs associated with freefall? why?

2.) Ignoring air resistance, what is the value and unit of freefall acceleration on earth?

3.) How are the signs of velocity and acceleration related to the terms "speeding up" and "slowing down"?

4.) express the following formula as an english sentence: d=1/2at2+ V0t

5.) how can we obtain velocity from an acceleration-time graph?

6.) how can we obtain displacement from a velocity-time graph?

7.) what is "freefall"?

Answer 1

1. Odd question

2. 9.8 m/s^2

3. Velocity and acceleration are usually both considered positive for speeding up, while they are of opposite sign for "slowing down".

4. Distance an object travels is calculated by taking the sum of 1/2 of the (assumed constant) acceleration multiplied by the square of the time during acceleration, plus the initial velocity multiplied by the time the object travelled.

5. Integrate over the interval of time of interest

6. Same as #5

7. An object released from a height, in the Earth's gravitational field, w/ no restraints, is said to be in "freefall".