Question detail

Forces and motion scenario: a car driver reacts, brakes, and transfers kinetic energy thermally. Which answer best addresses Uniform acceleration (HT only) and the objective to (HT only) Use consistent units for velocity, acceleration and distance?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Forces and motion

Question

A. In the car braking scenario, apply acceleration to (HT only) Use consistent units for velocity, acceleration and distance while keeping distance versus displacement separate.
B. In the car braking scenario, mix up distance versus displacement and ignore acceleration.
C. Use a general revision statement without applying Uniform acceleration (HT only) to the situation.
D. Choose a different forces topic instead of explaining (HT only) Use consistent units for velocity, acceleration and distance.

Answer

The correct answer is: In the car braking scenario, apply acceleration to (HT only) Use consistent units for velocity, acceleration and distance while keeping distance versus displacement separate.

Explanation

The correct option is In the car braking scenario, apply acceleration to (HT only) Use consistent units for velocity, acceleration and distance while keeping distance versus displacement separate.. It is correct because the scenario says a car driver reacts, brakes, and transfers kinetic energy thermally, which must be interpreted through Uniform acceleration (HT only). This directly supports the learning objective to (HT only) Use consistent units for velocity, acceleration and distance. Use values 8, 14, and 11 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error distance versus displacement.

Common mistake

Unit mismatch in uniform acceleration calculations

Students often mix metres per second with kilometres per hour for velocity while keeping acceleration in m/s² and distance in metres, leading to incorrect results

Always convert all velocities to the same unit (e.g. m/s) before using v²‑u² = 2as, and ensure distance is in metres and acceleration in m/s²

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