91Ó°ÊÓ

The mass of the ball is m = 0.70 kg .

The initial velocity of the ball is$v_i=5.0m/s$ .

The rebounding velocity of the ball is $v_f=-2.0m/s$.

The law of conservation of momentum states this. For two or more bodies in an isolated system acting on each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.

You can use the concept of the law of conservation of momentum.

Formula:

$P=m\left(v_i-v_f\right)$

Here, m is the mass, $v_i$is the initial velocity, and $v_f$is the final velocity.

The ball collides with initial velocity $v_i$and rebounds with final velocity $v_f$. Then the change in linear momentum of the ball is,

$$\begin{gathered} P=m\left(v_i-v_f\right) \\ =0.70kg\left[\left(5.0m/s\right)-\left(-2.0m/s\right)\right] \\ =4.9kg.m/s \end{gathered}$$

Hence, the change in linear momentum of the ball is $4.9kg.m/s$.