Science question:
worth a lot!

1. a 400 g toy car moving at 2 m/s collides and hooks up with 700 g toy car at rest and they move off together. what is their final velocity?

2. a car travels 15 km north, 10 km east, 20 km south, then 10 km west.
a. draw a diagram
b. what is the distance it travels?
c. what is ist displacement?

plz ! there is more than this but if u have the answer plz send it to me!

What refers to the existence of more than one level of government in the country

Astudy that involves interviews of adults is eligible for expedited review. the researcher wants to add an adolescent population (aged 12 to 17) to the study and has designed a parental permission and assent process. no additional changes are planned. which of the following statements about review of the revised protocol is accurate? the research would only be eligible for expedited review if the adolescents are capable of understanding the same consent forms used for the adult population.the research would only be eligible for expedited review if the adolescents have been declared to be emancipated minors.the new research would need full review by a convened irb because children are a protected population.unless the nature of the questions would raise the level of risk to > minimal for adolescents, the research would still qualify for expedited review.

In a response to public outcry over the internal revenue service's (irs) extent and abuse of power, the federal government has decided to disband the irs in favor of creating a new administrative agency to oversee taxation. as a business owner, what steps might you be able to take to ensure there are control's and limits to the agency's power? how does this compare with the controls available to branches of the government?