42 Two children are playing on stools at a restaurant counter. Their feet do not reach the footrests, and the tops of the stools are free to rotate without friction on pedestals fixed to the floor. One of the children catches a tossed ball, a process described by the equation (0.730 kg * m^2 * rad/s) + (0.120 kg * 0.350 m * 4.30 m/s) / (0.730 kg * m^2 + (0.120 kg * 0.350 m)^2).
(a) Solve the equation for the unknown @. The statement of the problem to which this equation applies must include the numerical information and specification of the unknown to be determined.
(b) Complete your statement.
(c) Could the equation equally well describe the other child throwing the ball? Explain your answer.