1)   An 80 kg man decides to go skydiving

1)

An 80 kg man decides to go skydiving. When approaching the ground it maintains a speed of 5 m / s. When it hits the ground, it slows down steadily for a distance of 1m. What is the force that the Earth exerts on the parachutist during the slowdown? What is the value of the slowdown?

2) 

A sports car with a given speed v has a stopping distance of 38m on dry road. Knowing that μs = 0.85 for the dry road and μs = 0.2 for the ice, what is the stopping distance of the same car at the same speed v on ice?