Acar with good tires on a dry road can decelerate at about 5.0m/s2 when braking. if the car is traveling at 30m/s, how much time does it take the car to stop?

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill