In each of Problems 1 and 2, determine we, R, and 6 so as to write the given expression in the form it = R cos(wnt 6). l. u = 3cos(21) +4sin(21) 2. u = 2cos(rrt) 3sin(1rt) 3. A mass of 100 g stretches a spring 5 cm. If the mass is set in motion from its equilibrium position with a downward velocity of 10 cmfs, and if there is no damping, determine the position it of the mass at any time I. When does the mass rst return to its equilibrium position