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## Homework Statement

Sam is running at 3.8 m/s and is 75m behind John who is running at a constant velocity of 4.2m/s. If Sam accelerates at 0.15m/s^2, how long will it take him to catch John?

## Homework Equations

d = (vf+vi/2)t

vf = vi + at

d = vit + 1/2at^2

vf^2 = vi^2 + 2ad

d = vft - 1/2at^2

## The Attempt at a Solution

I honestly do not know how to solve this problem...

I think I should probably find Δd of John first? His acceleration = 0, his initial and final velocity is 4.2m/s... correct? and for Sam, his initial velocity = 3.8m/s, his acceleration = 0.15m/s^s and would his Δd = -75m ....

I really don't understand this question or what I should begin to solve first and how...

Any help would be appreciated!