A mass m is attached to a spring which is held stretched a distance xmax by a force Fmax , and then released. The spring contracts, pulling the mass. For the following answers, assume that there is no friction. Use m for the mass, x for the distance xmax and F for the force Fmax. (a) Determine the speed of the mass when the spring returns to its normal length (x = 0). (b) Determine the speed of the mass when the spring returns to half its original extension (x = xmax/2).