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james swims at a speed of 2 m/s when she notices a shark is behind her and accelerates so that she is skimming at 4 m/s. if her average acceleration is 1.2 m/s how long did it take for james to speed up

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akiran007

Answer:

Time= t= 1.67 secs

Explanation:

Time= t=?= 1.67 secs

Initial Velocity= Vi = 2m/s

Final  Velocity= Vf  = 4m/s

Average Acceleration= av= Vf-Vi/t

Putting the values : 1.2m/s²= 4-2/t

Rearranging:          t= 2/1.2= 1.67 secs

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