A model airplane of mass 1.3kg is attached to a horizontal string and flies in a horizontal string and flies in a horizontal circle of a radius 6.4m, making 1.2 revolutions every 3s. (The weight of the plane is balanced by the upward "lift" force of the air on the wings of the plane)

The acceleration due to the gravity is 9.81 m/s^2.

Find the speed of the plane.

Answer in units of m/s.

Find the tension in the string.

Answer in units of N.