The parachute on a race car that weighs?

Question

The parachute on a race car that weighs 7250 N opens at the end of a quarter-mile run when the car is traveling 45 m/s. What total retarding force must be supplied by the parachute to stop the car in a distance of 1100 m?
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Answer 1

Use energy
.5*m*v^2=F*d
.5*7250*45^2=F*1100

6673 N
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