Physics Velocity Calculator — v=d/t, v=u+at, SUVAT Equations
Calculate velocity, displacement, time, acceleration, or initial velocity using the three SUVAT equations of motion. Step-by-step physics solutions.
v = d / t
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Step-by-Step Solution
Frequently Asked Questions
What is the difference between speed and velocity?
Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction). For example, 60 km/h is speed; 60 km/h northward is velocity. In one-dimensional problems, velocity can be positive (forward) or negative (backward).
What is uniform acceleration?
Uniform (constant) acceleration means the velocity changes by the same amount each second. Free fall near Earth's surface has approximately constant acceleration of g ≈ 9.81 m/s² downward. The equations of motion (SUVAT) apply only when acceleration is constant.
What are the equations of motion (SUVAT)?
The SUVAT equations: v = u + at, s = ut + ½at², v² = u² + 2as, s = ½(u+v)t. Where s=displacement, u=initial velocity, v=final velocity, a=acceleration, t=time.
What units are used for velocity and acceleration?
Velocity: m/s (SI), km/h, mph. Acceleration: m/s² (SI). To convert: 1 m/s = 3.6 km/h, 1 m/s² means gaining 1 m/s of speed every second.
What is free fall?
Free fall is motion under gravity alone (air resistance neglected). Near Earth's surface, acceleration = g ≈ 9.81 m/s². After t seconds, velocity v = g×t and distance fallen s = ½g×t².