A merry-go-round with a moment of inertia equal to 1250 kg•m2 and a radius of 2.5 meter rotates with negligible friction at 1.70 rad/s. A child initially standing still next to the merry-go-round jumps onto the edge of the platform straight toward the axis of rotation, causing the platform to slow to 1.35 rad/s. Compute what is her mass?