# Collision of Objects A and B#

Santiago observes object A, which has mass $${{params.m_a}}$$ and velocity $$v_0 \vec{i}$$, collide with object B, which has mass 5 $$kg$$ and a velocity 1/3 $$v_0 \vec{j}$$. Following the collision, object B has a velocity of 1/3 $$$v_0 \vec{i}$$$.

Use the following table as a reference for each variable:

$$Variable$$

Use

$$v_0$$

v

$$\hat{i}$$

i_hat

$$\hat{j}$$

j_hat

## Part 1#

Determine the velocity of object A after the collision.

Please enter in a value in .

## Part 2#

Is this collision elastic?

• Yes

• No

## Part 3#

Express the change in the kinetic energy in terms of $$v_0$$ (use v for $$v_0$$ ).

Suppose a second person observes the same collision. This second observer, however, is moving with a velocity of $$$v\_{2nd} = v_0 \vec{i} - v_0 \vec{j}$$$ m/s relative to Santiago. What is the change in kinetic energy that this second observer measures?