Work energy theorem speed change
A \(7\,\text{kg}\) cart in a bike trailer investigation changes speed from \(5\,\text{m s}^{-1}\) to \(9\,\text{m s}^{-1}\). Calculate the change in kinetic energy. Identify the force, momentum, or energy relationship before entering the result. Enter the numerical result and choose the interpretation that matches the mechanics meaning.
Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.