Question

You and the police chief You are driving North through an intersection in a 55 mi/hr speed zone, when the local Chief of Police, who is driving his new Cadillac and approaching the intersection from the West, hits you broadside. The two cars stick together and skid a distance 28.5 m with locked wheels at an angle of 67.2° to the East of North. The mass of your car is 1479.0 kg while the Cadillac has a mass 2020.0 kg. The coefficent of sliding friction is 0.90. The Chief of Police is angry that you have damaged his new Cadillac and gives you a ticket for speeding. The local judge is going to believe his Chief of Police rather than some out-of-town student. You realize that the knowledge you learned in your physics course is your only hope for acquittal. Compute the speed of the Chief of Police immediately prior to the collision. Submit Answer Tries 0/8 Compute your speed immediately prior to the collision as evidence for or against the speeding ticket. Submit Answer Tries 0/8

Answer 1

72 m,tm2 P E m 2020 Ca of afler Cellinon i's v Speed bo Cars Phen d v2 M (due to frichan 2a VT2ad V 2x0-30x9.61 x24-S V= 22-4 m/ momenhum in -direthon of Canscrvthn Mitm)v n 7.2 m Vp 2020x V - (1449+2020) x 22.4x nnc.2 Speed of g0.12 mihr 35.92 mls VP Car of chiet police momenhim in y-direchon Conserv chan of Unra mitmvCos (67-2) C479+2020) X 22 4y Cos(67-2) mzvz 2 149 45.32 milhr Your SpeedV2 20.53 Mls