posted by Melody .
The parachute on a race car of weight 8850 N opens at the end of a quarter-mile run when the car is traveling at 31 m/s. What total retarding force must be supplied by the parachute to stop the car in a distance of 1000 m?
[so for this one, i need to know the mass and acceleration. i used the at+v0 =v equation and the distance=.5at^2+v0t equation to solve for t which i got as 64.5 seconds. and then I plugged that into the at+v0 =v to get acceleration of -.4805=a anddd now i don't know what to do. please let me know if the prev. steps were correct!] thank you