A particle starts at time =0 and moves along the x-axis so that its position at any time 7 is given by 120 is given by x(7) = (t2)3 (-3). a) Find the velocity of the particle at any time 72>0. b) For what values of 7 is the velocity of the particle less than zero? c) Find the value of 7 when the particle is moving and the acceleration is Zero. Consider the curve defined by the equation ycosy=x+1for0