What is the upward force acting on a skydiver of mass 60\,kg who is...

Since the skydiver is falling at a uniform speed, the acceleration is zero.

According to Newton's second law, the net force acting on the skydiver is zero.

The upward force (air resistance) must perfectly balance the downward force (weight).

$F_{\text{up}} = mg$

$F_{\text{up}} = 60 \times 9.8 = 588\,\text{N}$

Answer: $588\,\text{N}$