Topic explanation

Standard explanation

Instantaneous velocity is v=ds/dt; its sign gives direction along the chosen axis.

Key points

• Velocity as rate of position
• rule
• worked example
• Velocity as rate of position: Instantaneous velocity is v=ds/dt; its sign gives direction along the chosen axis.
• CONCEPT AND RULE: Instantaneous velocity is v=ds/dt; its sign gives direction along the chosen axis.
• METHOD: For velocity as rate of position, identify the given information and required result. Select the mat
• Instantaneous velocity is v=ds/dt; its sign gives direction along the chosen axis.
• Worked pattern: If s=t²-4t, v=2t-4.

Labelled diagram