contestada

A skydiver jumped out of a plane, determine distance he descended after 5 seconds. Gravity is pulling him down at 10 m/s^2 (air resistance is negligible).

Respuesta :

Answer: 125 m

Explanation:

This problem is related to vertical motion and can be solved with the following equation:

[tex]y-y_{o}=V_{o}t-\frac{1}{2}gt^{2}[/tex] (1)

Where:

[tex]y-y_{o}=\Delta y[/tex] is the difference between the final height [tex]y[/tex] and initial height [tex]y_{o}[/tex]. Let's take into account the initial height is greater than the final height, since the skydiver is descending.

[tex]V_{o}=0 m/s[/tex] Is the skydiver's initial velocity, assuming the plane was not moving at that moment

[tex]t=5 s[/tex] is the time

[tex]g=10 m/s^{2}[/tex] is the acceleration due gravity

Solving the equation:

[tex]\Delta y=-\frac{1}{2}gt^{2}[/tex] (2)

[tex]\Delta y=-\frac{1}{2}(10 m/s^{2})(5 s)^{2}[/tex] (3)

[tex]\Delta y=-125 m[/tex] (4) Here, the negative sign only indicates the position of the skydiver, and remember the initial height is greater than the final height.

In fact, the distance is positive: 125 m