Spinned ball's rotation when it hits the net

When opponent puts a spin on a ball, hits the net and goes over, what happens to ball's rotation? It's way more difficult to block and return it as you would the original spin. 

Hi Steven,

The ball will feel like it had more topspin on it after it hits the net.  This is however only because the ball has slowed down so the ratio of speed to spin had changed.  There is more spin in relation to the speed so the ball will go up off your bat.