You want to calculate the net force acting on an ice skater who is speeding up while skating. Which of these is a force you would not add in to calculate the net force?

upward vertical force from the ice that supports the skater

force that the skater exerts on the ground

force exerted on the skater by the ground in reaction to the force the skater

exerts on the ground

gravity

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?