A ball with a mass of #3 kg# moving at #8 m/s# hits a still ball with a mass of #4 kg#. If the first ball stops moving, how fast is the second ball moving?

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Answer 1 · 2018-07-31T06:35:34

The speed of the second ball is #=6ms^-1#

#m_1u_1+m_2u_2=m_1v_1+m_2v_2#

The mass #m_1=3kg#

The velocity #u_1=8ms^-1#

The mass #m_2=4kg#

The velocity #u_2=0ms^-1#

The velocity #v_1=0ms^-1#

Therefore,

#3*8+4*0=3*0+4*v_2#

#v_2=24/4=6ms^-1#