Nota cultural question 1 with 1 blankanoche / mi esposa y yo / saber / que / carlos y eva / divorciarse question 2 with 1 blanklos / (nosotros) conocer / viaje / isla de pascua question 3 with 1 blankno / (nosotros) poder / hablar / mucho / con / ellos / ese día question 4 with 1 blankpero / ellos / ser / simpático / y / nosotros / hacer planes / vernos / con más / frecuencia

pure substance: iron,copper

impure substance: water,charcoal

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

i believe the answer is three water molecules