While catching a cricket ball the fielder lowers his hands backwards. Why?

When a cricket player catches the ball he pulls his hand gradually in the direction of the ball 's motion given reason

A cricketer pulls his hands back while catching a ball to lower the __________ on his hands .

Why is it difficult to catch a cricket ball than a tennis ball even when both are moving with the same velocity?

If a ball is thrown up in a moving train, it comes back to the thrower's hands. Why?

If a gymnast sitting on a rotating stool, with his arms out stretched, suddenly lowers his hands, what will happen?

Shylesh has some pet animals at his ho.me. He has few rabbits too. One day while feeding them he observed something different with the teeth. He asked his grandfather, why is it so? What would have been the explanation of his grandfather?

Ganesh is a champion in cricket in his school. When he is in the ground (for practice) and he used to whirl his bat in different style. His coach was Mr. Gunalan. The coach asked Ganesh to hold the bat at its handle and roatate fastly. But Ganesh could not do as his coach said, Ganesh developed pain in his hands. Then his coach told him to rotate the bat by holding it at its mid point. When Ganesh rotated at this position, he was able to rotate the bat faster. Ganesh was surprised and asked his coach how. (i) What was coach's explanation to Ganesh ? (ii) What is Radius of Gyration ? Give an example. (iii) How moment of Inertia is related with Angular velocity ?