Which equation can be used to calculate the normal force on an object if you know the speed of the object, the coefficient of kinetic friction, and the force
of kinetic friction on the object?
Ffriction
O A. FN
HA
us
B. FM
Ffriction
νμ,
C. FN
Ffriction
D. Fn = M Ffriction

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?