The police are investigating an accident. They have determined that the mass of car A is 2275kg and the mass of car B is 1525kg. From the skid marks and date for the friction btw tires and concerte, the police determined that the cars, when they were locked together, had a velocity of 31km/h at angle of 43 degrees north of the eastbound street. If the speed limit was 35km/h on both streets, should one or both cars be ticketed for speeding?
2007-08-10 07:26:30 · 1 answers · asked by nick_zz 1 in Science & Mathematics ➔ Physics
One assumption is that the heavier vehicle was eastbound and the lighter vehicle northbound:
2275Va = (3800)(31)cos43°
Va = 37.87 kph
1525Vb = (3800)(31)sin43°
Vb = 52.68 kph
The other assumption is that the heavier vehicle was northbound eastbound and the lighter vehicle eastbound:
2275Va = (3800)(31)sin43°
Va = 35.31 kph
1525Vb = (3800)(31)cos43°
Vb = 56.49 kph
Technically, both cars were exceeding the speed limit in either case, but in the 2nd case the heavier car's speed rounds to 35.
2007-08-10 17:41:39 · answer #1 · answered by Helmut 7 · 1⤊ 0⤋