physics
posted by john .
A cheetah runs a distance of 102 m at a speed of 27 m/s and then runs another 102 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed?

Average speed means total distance traveled divided by time. It is a average over time, not an average over distance.
Total time = 204/Vav = 102/34 + 102/27
2/Vav = 1/34 + 1/27
Solve for Vav
Vav = 2/[1/34 + 1/27] = 30.1 m/s
Note that it is not the average of 27 and 34.That would be 30.5 m/s.
Respond to this Question
Similar Questions

physics
A cheetah runs a distance of 97 m at a speed of 26 m/s and then runs another 97 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed? 
Physics
A cheetah is hunting. Its prey runs for 3.07 s at a constant velocity of +11.32 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time? 
physics
A cheetah is hunting. Its prey runs for 4.3 s at a constant velocity of +8.4 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time? 
Physics
A cheetah runs a distance of 101 m at a speed of 24 m/s and then runs another 101 m in the same direction at a speed of 38 m/s. What is the cheetah's average speed? 
physics
A cheetah is hunting. Its prey runs for 2.9 s at a constant velocity of +9.9 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time? 
science
a cheetah runs at a distance of 200meters in 10 seconds .what is the speed of cheetah in m/s and km/h 
Physics
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 83 km/h. (a) Determine the cheetah's average … 
physics
The cheetah can reach a top speed of 114km/h (71mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50m in a straight line reaching a final speed of 91 km/h. a.) Determine the cheetah's average acceleration … 
science
a cheetah runs at a speed of 30.0m/s. How long does the cheetah take to run 90.0m 
Science/Physics
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 73 km/h.