[1A.] [4 points] For certain situations the drag force FD is proportional to an object's velocity v and given by FD=-bv, where b is the constant of proportionality that depends on the fluid's viscosity and the size and shape of the object. Assuming SI units using meters (m), kilograms (kg), and seconds (s), what are the units of b?

[1D.] [6 points] Threeforceswithmagnitudes1.0N,2.0N,and3.0N pull on an object located at the origin at angles of 0 , 90, and 135 degrees, respectively, measured counter-clockwise with respect to the x-axis. What is the magnitude and direction of a fourth force (measured with respect to the x-axis) such that the object remains at rest?

[1E.] [6 points] A particle of mass 4 kg, initially at rest at x=0, is accelerated by a time dependent force given by =3.0 , where the force is measured in Newtons and t is measured in seconds. What is the particle's velocity and acceleration at t=3.0 seconds?