A student solving a physics problem for the velocity

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

Which object is most likely represented by a dot?

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest