A ball of mass 4 kg moving at 6 m/s collides with another ball of mass 6 kg moving at 4 m/s in the same direction. If the balls move together after the collision in the same direction, find their common velocity

1. él lava el pelo cada día. (he washes his hair every day.)2. ella sienta enferma hoy. (she feels sick today.)3. él ve en el teatro. (he sees her in the theater.) 4. ducho por la mañana. (i shower in the morning.) 5. los niños cepillan los dientes cada día. (the children brush their teeth every day.) 6. por la noche, quito la ropa. (at night, i take off my clothes.) 7. mi hijo baña por la noche. (my son takes a bath at night.) 8. ponemos la ropa juntos. (we get dressed together.)9. doy la comida cada día. (i give them food every day.) 10. preocupo por el futuro. (i worry about the future.)