Analysis of the mechanics of skydiving

[huc369]

Homework Statement

5. A skydiver does a low-altitude skydiving performance. After leaving the hovering aircraft, he first did a free fall exercise, began to open the parachute when it was 125m above the ground, and reduced his speed to 5m/s when reaching the ground. If it is considered that the athlete is doing a uniform deceleration exercise until the beginning of opening the parachute until landing, the acceleration is 12m/^2s, and g is taken as 10m/s^2. Ask for the speed when he opens the parachute

Relevant Equations

I googled it but understand what's going on

 

[Lnewqban]

Imagine a car accelerating from a stop through a certain distance.
It increases its speed in 10 additional m/s after each second.
Then, at 125 meters away from a wall, the driver applies the brakes at a constant rate.
Beyond that point, the speed of the car decreases in 12 m/s after each second.
Finally, the car hits the wall at a speed of 5 m/s.

What was the speed of the car when the driver applied the brakes?

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