Sticky crashes': A 700 kg car is traveling at 10 m/s. It hits a 300 kg car that is parked. Their bumpers lock and the two roll forward together. With what velocity do they roll forward?​

7 m/s

Explanation:

Find the total mass

m1+m2 = total mass

700kg+300kg = 1000kg

Find the velocity of each mass

v1 = 10m/s

v2 = 0m/s

Find the combined momentum

m1v1 + m2v2 = mfvf

(700)(10)+(300)(0)=(1000)(vf)

7000=1000(vf)

7=vf

So the velocity of the two cars rolling together is 7 m/s

i think the answer is bone

third one with arrows on top of each other going the same direction