7. a 1000 kg car is rolling down the street at 2.5 m/s. how fast would a 2500 kg car have to
collide into it in order to bring it to rest (0 m/s)?

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

i believe the answer would be:

d. violin, clarinet, french horn, and tuba