You and Sureshs need some remedial physics. You continue to think that momentum which is a measure of energy is not related to force.
Two cars collide. Each car has some momentum coming into the crash. But what deforms the metal and mangles the cars up? It is not "momentum", it is force applied by one car on the other and vice-versa. This why higher speed crashes destroy cars much more than lower speed crashes. The car deceleration is so much higher resulting a much higher force applied.
And how can you say there is no acceleration involved just velocity? if there was no acceleration/deceleration all balls would have to be moving at the same constant speed all the time. Obviously not what happens when playing tennis.
Don't bother replying. I am not going to.
What a stupid post.
The force applied by one body on another is equal to the force applied by the other body on the other, during the collision. There is no net external force. There is a massive impulsive force each body experiences due to the collision.
No one said acceleration is not involved. It is involved in the build up to the velocity. It does not matter if the velocity was built-up gradually as done by the pros, or by sudden acceleration before impact (which is not how the pros do it). The misconception arises because some people mistakenly teach that the pros swing abruptly hard just before impact, despite tons of evidence to the contrary. To support their theory, they insist on talking about acceleration at impact. Their knowledge is as poor as yours, and like you, they don't want to correct it either.