Final answer:
Without a specific function for z, the question seems incomplete. However, generally to find dz/dt using the chain rule, if z is a function of x, which itself is a function of t, we would multiply the derivative of z with respect to x by the derivative of x with respect to t.
Step-by-step explanation:
The question involves applying the chain rule to find dz/dt, which signifies how the variable z changes with respect to time (t). The chain rule is a fundamental tool in calculus, used for computing the derivative of a composite function. According to the information provided, we have variables like velocity (v), displacement (ds), acceleration (a), and derivatives with respect to time. While there is not a clear function provided for z, nor its dependence on t, generally, if z is a function of another variable, say x, which in turn is a function of t, i.e., z = f(x) and x = g(t), then by the chain rule, dz/dt = (df/dx) * (dx/dt)