Object1 of mass 6 kg moving down at -35°C and 20 m/s collides and sticks to object2 of mass 8 kg which was initially moving up at 50o and 25 m/s. What is the final velocity of the combined objects?

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

i don't understand. explain it clearly