Two gliders are moving on a horizontal frictionless air track. Glider 1 is moving to the right (positive x-direction) with a speed of 2.261 m/s. Glider 2 has mass m2 = 288.7 g and is moving to the left (negative x-direction) with a speed of 3.539 m/s. The gliders undergo a totally elastic collision. The velocity of Glider 1 after the collision is -4.895 m/s. What is the mass of Glider 1?