the qns is when a tennis ball collide with a train, can the ball stop the train for a split sec, since during collision, the ball have to change direction so velocity at some point in time is equal to zero. Being at V= 0 for that split sec, and since the ball is in contact with the train, we can deduce that the train also stop temporaryly.

I know the qns has been ask B4. At that time, the answer given was that acceleration for the change of velocity is infinity, so V can nv be zero.

Now the REAL qns is how do u prove it mathematically(not logically)

that acceleration is infinity?

P.S. i tried to search for the thread but couldn't find it.(honest)