Question

A ball with initial momentum
P collides with
rigid wall clastically. If p' be it's momentum
after collision then​

Answer 1

Answer:

Final momentum will be -p OR p in the opposite direction to the initial one

Explanation:

elastic collision means that the ball rebounds with the same velocity as it had before the collision

now velocity is in opposite direction, therefore momentum is same but in opposite direction

Answer 2

Answer:

The correct option is B)

In an elastic collision, when an object collides with an object with its mass much greater, the heavier body remains practically at rest. In this example, the rigid wall plays the role of the heavier object. Let the velocity of the ball be v.

$v_{2}$−(−$v_{1}$ )=$eu_{1} -u_{2}$ ($v_{2}$ and $v_{1}$ are in opposite direction)  But for elastic collisions, e=1 and the velocity of wall remains zero. Thus we get

$v_{2} = -v_{1}$

or

$mv_{2} = -mv_{1}$

or      

​ P′ =−P