A ball with a mass of #2kg# moving at #1 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?

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Answer 1 · 2016-11-16T18:20:05

The answer is #=2/3ms^(-1)#

Here it's an elastic collision with no loss of kinetic energy.

#m_1u_1+m_2u_2=m_1v_1+m_2v_2#

#m_1=2 kg#

#u_1=1 ms^(-1)#

#m_2=3 kg#

#u_2=0#

#v_1=0#

#v_2=?#

#2*1+3*0=0+3v_2#

#v_2=2/3 ms^(-1)#