Posted by Lycra on Friday, April 13, 2012 at 6:01am.
A truck of mass 2000kg travelling due south collides at an intersection with a car of mass 1200kg travelling due east. The car and truck become entangled and move off to the southeast. The truck driver claims to have been travelling at exactly 60km/hr(the speed limit) just prior to impact. Determine whether the car was exceeding the speed limit.

physics  drwls, Friday, April 13, 2012 at 7:00am
To have a final southeast direction, the initial momenta of the truck and car must have been equal in magnitude.
If the heavier truck was travelling at the 60 km/h speed limit, the car must have been going 100 km/h.
(100*1200) = (60*2000)
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