Who is rotengen and what was his discovery

Wilhelm Roentgen, Professor of Physics in Worzbury, Bavaria, was the first person to discover the possibility of using electromagnetic radiation of create what we now know as the x-ray

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer