During acceleration, which two kinematic variables increase progressively?

During acceleration, which two kinematic variables increase progressively?

• A. Stride length and stride rate
• B. Ground contact time and flight time
• C. Arm swing and knee lift
• D. Step width and toe-off angle

Answer: (A)

Velocity in sprinting can be thought of as stride length times stride rate. During acceleration you progressively increase both how far you move the body with each step (stride length) and how frequently you take steps (stride rate), so speed rises as both variables climb. Other factors like ground contact time tend to shorten as cadence increases, and arm swing, knee lift, or step width can change with technique but do not inherently and reliably rise in a simple progressive way to drive velocity, which is why the combination of longer strides and faster steps best explains accelerating.

Velocity in sprinting can be thought of as stride length times stride rate. During acceleration you progressively increase both how far you move the body with each step (stride length) and how frequently you take steps (stride rate), so speed rises as both variables climb. Other factors like ground contact time tend to shorten as cadence increases, and arm swing, knee lift, or step width can change with technique but do not inherently and reliably rise in a simple progressive way to drive velocity, which is why the combination of longer strides and faster steps best explains accelerating.