Gretchen runs the first 4.0 km of a race at 5.0 m/s. Then a stiff wind comes up, so she runs the last 1.0 km at only 4.0 m/s. If she runs fhe same course again, what constant speed would let her finish in the same time as in the first race?

The velocity is

Explanation:

From the question we are told that

   The first distance is  

   The  first speed  is  

    The  second distance is  

    The  second speed  is  

Generally the time taken for first distance is  

The time taken for second  distance is

The total time is mathematically represented as

=>  

=>    

Generally the constant velocity that would let her finish at the same time is mathematically represented as

=>    

=>    

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speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation: