Brown Tractor
Need help with velocity for Physics :-/?
Paul is driving north along a rural 2 lane highway at 50 mph with Lisa riding in the passenger seat. Suddenly, from behind, Danica Patrick goes blazing past them at 200 mph in a race car, barely missing them and Farmer Brown, who is driving his tractor in the other lane at 35 mph south. Assume the road is perfectly straight and north is positive.
I answered the following questions, but I am not 100% sure about them..
What is the velocity of Lisa in the frame of reference of Paul?
0 km/h
What is the velocity of Farmer Brown in the frame of reference of Lisa?
-24 km/h
What is the velocity of Danica in the frame of reference of Paul?
400 km/h
What is the velocity of Paul in the frame of reference of Danica?
240 km/h
What is the velocity of Danica in the frame of reference of Framer Brown?
264 km/h
If you could tell me whether I’m right or wrong, I would really appreciate it. I’m not the greatest at physics 
What is the velocity of Lisa in the frame of reference of Paul?
0 km/h
CORRECT
What is the velocity of Farmer Brown in the frame of reference of Lisa?
-24 km/h
WRONG – L&P going North at 50 mph, FB going South at 35 mph gives a difference of 85 mph or roughly 136 kph. THe minus sign to indicate direction is fine.
What is the velocity of Danica in the frame of reference of Paul?
400 km/h
WRONG – Danica is doing 200 mph, Paul 50 mph in the same direction, difference is 150 mph = 240 kph, which would be positive
What is the velocity of Paul in the frame of reference of Danica?
240 km/h
WRONG it is -240kph, the negative of the previous answer
What is the velocity of Danica in the frame of reference of Framer Brown?
264 km/h
WRONG – there is a difference of 235 mph = 376 kph
sign would be positive
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