Use the definition to find an expression for the instantaneous velocity of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s). Then calculate the instantaneous velocity for the given value of t. s = 2t2 - 5t; t = 2 . . . The expression for the instantaneous velocity of the object is The instantaneous velocity after 2 s is ft/s.f (x + h) - f(x) Use f'(x) = lim to find the derivative at x for the given function. h-0 h s(X) = 4x + 3 . . . s'(X) =