Motion with constant acceleration The standard equation for the position s of a body moving with a constant acceleration a along a coordinate line is s = (a/2)t² + v₀t + s₀, where v₀ and s₀ are the body’s velocity and position at time t = 0. Derive this equation by solving the initial value problem
Differential equation: d²s/dt² = a
Initial conditions: ds/dt = v₀ and s = s₀ when t=0.

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Start with the given second-order differential equation: \(\frac{d^{2}s}{dt^{2}} = a\), where \(a\) is a constant acceleration.

Integrate the acceleration once with respect to time \(t\) to find the velocity \(v(t) = \frac{ds}{dt}\). This gives \(v(t) = \int a \, dt = a t + C_1\), where \(C_1\) is an integration constant.

Use the initial condition for velocity: at \(t=0\), \(v(0) = v_0\). Substitute to find \(C_1\): \(v_0 = a \cdot 0 + C_1\), so \(C_1 = v_0\). Thus, \(v(t) = a t + v_0\).

Integrate the velocity function \(v(t)\) with respect to time \(t\) to find the position function \(s(t)\): \(s(t) = \int (a t + v_0) \, dt = \frac{a}{2} t^{2} + v_0 t + C_2\), where \(C_2\) is another integration constant.

Use the initial condition for position: at \(t=0\), \(s(0) = s_0\). Substitute to find \(C_2\): \(s_0 = \frac{a}{2} \cdot 0^{2} + v_0 \cdot 0 + C_2\), so \(C_2 = s_0\). Therefore, the position function is \(s(t) = \frac{a}{2} t^{2} + v_0 t + s_0\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Second-Order Differential Equations

A second-order differential equation involves the second derivative of a function, representing acceleration in this context. Solving such equations requires integrating twice to find the original function, here the position s(t). Understanding how to handle these equations is essential to derive motion formulas from acceleration.

Initial Value Problems

An initial value problem specifies the values of a function and its derivatives at a particular point, allowing unique solutions to differential equations. Here, the initial velocity v₀ and position s₀ at time t=0 provide conditions to determine integration constants after solving the differential equation.

Kinematic Equations for Constant Acceleration

Kinematic equations describe motion under constant acceleration, linking position, velocity, acceleration, and time. The given formula s = (a/2)t² + v₀t + s₀ is derived by integrating acceleration twice and applying initial conditions, illustrating the connection between calculus and classical mechanics.