A ball strikes against the floor and distance with double the velocity which type of collision is it
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Yes, the momentum has changed.
If the ball has a mass of “m” and speed “v”. Its velocity is a vector that points towards the wall. The momentum is mass x velocity, so it is a vector that points in the same direction as the velocity.
After the ball has a perfect elastic collision with the wall (no loss of energy) the speed of the ball is the same. But its velocity is now pointing away from the wall. Since momentum is mass * velocity it has changed.
Before:
p = m * v * x
where x is a unit vector pointing towards the wall
After:
p = m * v * -x = -m * v * x
The net change in momentum is 2mv
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