Question

why a diver performs somersaults by jumping from a height diving board keeping his legs and arms out stretched first and then colouring his body?​

Answer 1

Explanation:

Before lifting off the diving board the diver legs and arms fully extended, which means that the diver has large moment of inertia I1 about one axis. The moment of inertia considerable reduced to a new value I2 when the legs and arms are drawn into closed tuck position. As angular momentum is conserved, the diver spins faster when its moment of inertia becomes smaller.