Dark matter has been detected by its gravitational pull.
Direction because if you're moving in a circle the direction is constantly changing
Answer:
The work done is 
Explanation:
<u>Data</u>
- Mass:

- height:

- acceleration due to gravity:

Non conservative force act
The work is:
Δ
+Δ
KE and PE means kinetic energy and potential energy respectively.
The change in kinetic energy is 0, since the skydiver’s velocity remains constant.
Therefore
Δ
Δ

substitute the values

That was pretty clever, how you neatly and cleanly cut off the part of the photo that shows the formula we're supposed to use.
At time=0, the position is zero, and at time=5 sec, the position is 20 m.
Slope = (change in position)/(change in time)
Slope = (20m - 0m) / (5s - 0s)
Slope = (20m) / (5s)
<em>Slope = 4 m/s</em>