Learning Resources

Investigation 2: Did Mr. Lam Deserve a Ticket?

Test yourself (Answers)

1. For 12:44:00 the point is (60,1276) and 12:45:00 the point is (120,2520). Using the slope formula we have

   

   We interpret this as an average rate of 20.73 m/s which converts to 74.6 km/h
   
   

2. For 12:44:15 the point is (75,1668) and 12:44:45 the point is (105,2390). Using the slope formula  we have

   

   We interpret this as an average rate of 24.07 m/s which converts to 86.65 km/h
   
   

3. For 12:44:25 the point is (85,1928) and 12:44:35 the point is (95,2193). Using the slope formula  we have

   

   We interpret this as an average rate of 26.5 m/s which converts to 95.4 km/h
   
   

4. From this progression we could estimate the slope of the tangent or the speed at 12:44:30 to be a little larger than 95.4 km/h.