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## Homework Statement

A powerboat, starting from rest, maintains a constant acceleration. After a certain time t, its displacement and velocity are r and v. At time 2t, what would be its displacement and velocity, assuming the acceleration remains the same?

a) 2r and 2v

b) 2r and 4v

c) 4r and 2v

d) 4r and 4v

**the correct answer is c**

## Homework Equations

v = vo + at

x = vo + 1/2at^2

## The Attempt at a Solution

r = vo + 1/2at^2

r = (0) + 1/2a(2T)^2

r = 1/2a4T^2

v = vo + at

v = (o) + a(2T)

v = a2T

i don't know what to do next because acceleration is not given so how i could i even isolate anything?