Amass hanging from a spring is set in motion and its ensuing velocity is given by v(t) = - 41 sin it for t20. assume that the positive direction is upward and s(0) = 4. a. determine the position function for t20. b. graph the position function on the interval 0,3). c. at what times does the mass reach its lowest point the first three times? d. at what times does the mass reach its highest point the first three times?