A mass of 50 g stretches a spring 1.568 cm. If the mass is setin motion from its equilibrium position with a downward velocity of50 cms, and if there is no damping, determine the position u of themass at any time t. Enclose arguments of functions in parentheses.For example, sin(2x). Assume g=9.8 ms2. Enter an exact answer.u(t)= m When does the mass first return to its equilibriumposition? Enter an exact answer. t=
