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One dimensional kinematics

  • Thread starter katyross
  • Start date
  • #1
5
0

Homework Statement


"A race car driver must average 180 km/h for 4 laps to qualify for a race. Because of engine trouble, the car averages only 150 km/h over the first 2 laps. What speed must be maintained for the last 2 laps?"


Homework Equations



v= d/t

The Attempt at a Solution


i actually have no idea where to start with this
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
Find total time for 4 laps with average velocity 180 km/h.
Find total time for 2 laps with average velocity 150 km/h.
Find total time for remaining 2 laps with average velocity v km/h.
Equate the first one with the sum of the other two.
 

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