A constant torque \(3 \mathrm{~kW}\) motor drives a punching machine. The mass of the moving parts including the flywheel is \(130 \mathrm{~kg}\) at \(750 \mathrm{~mm}\) radius. One punching operation absorbs \(1 \mathrm{~kg}\) of energy and takes \(1 \mathrm{~s}\). Speed of the flywheel is \(240 \mathrm{rpm}\) before punching: Determine

(a) the number of punches per hour and

(b) reduction in speed after the punching operation.