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### 11.6 Example 6

A mobile A with a mass of 3 kg and velocity of 50 m/s, is moving in the positive X direction. A second mobile B with a mass of 5 kg, and velocity of 75 m/s, is moving in the positive X direction too. If the A mobile impact the B mobile and if the impact is elastic, which is the velocity of each mobile after the impact?

Solution with FisicaLab

Erase the content of the chalkboard and select the SI system. And add one element Collision, and two elements Mobile in X. As show the image below: To the element Mobile in X at the left, that we assume is the mobile A, write:

Name

A

m

3

vxi

50

vxf

vf_A

To the other mobile, the B mobile, write:

Name

B

m

5

vxi

75

vxf

vf_B

To the element Collision write:

Object 1

A

Object 2

B

e

1

angn

0

e is 1 because the collision is elastic, and angn is 0 because the impact is central. Now click in the icon Solve to get the answer:

```vf_A = 81.250 m/s ;  vf_B = 56.250 m/s ;
Status = success.

```