As a roller coaster car starts down a slope, it’s velocity is 4m/s. but 3 seconds later it’s velocity is 22m/s in the same direction. what is its acceleration

Let f(t) be a function on [0, infinity). the laplace transform of f is the function f defined by the integral f(s)equalsintegral from 0 to infinity e superscript negative st baseline f left parenthesis t right parenthesis dt. use this definition to determine the laplace transform of the following function.