# A ball with a mass of #5 kg# moving at #2 m/s# hits a still ball with a mass of #3 kg#. If the first ball stops moving, how fast is the second ball moving?

##### 2 Answers

#### Explanation:

One ball of mass

By the conservation of momentum in moving direction of first ball

#### Explanation:

We use the law of conservation of momentum, which states that:

where:

#m_1,m_2# are the masses of the two balls

#u_1,u_2# are the initial velocities of the two balls

#v_1,v_2# are the final velocities of the two balls

So, we get: