The driver of a 9800 N car is cruising along at 35 m/s and removes her foot from the gas pedal for 7s when her speed is then 30 m/s. What force of friction caused her car to slow down during that
time. Draw and completely label a free-body diagram for full credit.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

conservation of mass

mass before something happens = mass afterwards

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures