1. A force of 516 N is required to just get a mass of 75 kg moving along a horizontal surface. While a force of 630 N cause the mass to accelerate at 6 m/s².

a. Calculate the coefficient of staticfriction

b. Calculate the coefficient of kineticfriction

2. An 85 kg skydiver is jumping from an airplane. If the magnitude of the air resistance actingonthe skydiver is constant and equals to 493 N [upward],Find

a. the acceleration of the skydiver 5 secondslater.

b. the distance moved in the 5seconds