user: In my physics class, we're delving into kinematics, and I've been tasked with analyzing the motion of a particle. The equation f(x) = 3t^2 + 2t + 1 describes its position over time. I need to determine the velocity of this particle when t is 5 seconds. Velocity is the first derivative of the position function with respect to time, so I need to calculate that. Can you help me find the velocity using the appropriate function?

Available functions:
name: math_gcd
description: Calculates the greatest common divisor of two numbers.
parameters: type: dict
properties: a: type: integer
description: The first number. This should be the larger number.
b: type: integer
description: The second number.
required: a
b
name: estimate_derivative
description: Estimate the derivative of a function at a given point.
parameters: type: dict
properties: function: type: string
description: The function to calculate the derivative of. This should be the string literal of lambda function
x: type: integer
description: The point to calculate the derivative at.
required: function
x

Ground truth function call(s):
estimate_derivative(function='lambda x: 3*x**2 + 2*x + 1', x=5)