(or) 17. a) at t = 2s, t = 6 s they are in same phase slopes are same b) at t = ls, t=5 s slopes are same. The displacement of a particle varies with time according to the relation y = a sin ox+b Cos or a) The motion is SHM b) The motion is SHM with amplitude a + blah c) The motion is SHM with amplitude a² + b2 d) The motion is SHM with amplitude Va? + b² a) the displacement equation satisfies Sol: dy = w²y di? . It represents S.H.M b) y = a sin ax + b cos ax y= A, sin , + A, cose ::0=90° ..A= A + A + 2A, A, cos 0 = Va? + b² + 2ab cos 90° = Va? + b2