Two equal masses travel towards each other on a frictionless air track at speeds of $60 cm s^{–1}$ and $30 cm s^{–1}$. They stick together on impact. What is the speed of the masses after impact?
$15 cm s^{–1}$
2 )
$20 cm s^{–1}$
3 )
$30 cm s^{–1}$
4 )
$45 cm s^{–1}$
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