Question detail

Forces and motion scenario: a trolley accelerates down a ramp while a timer records motion. Which answer best addresses Uniform acceleration (HT only) and the objective to (HT only) Use v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known?

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 trolley ramp scenario, apply final velocity to (HT only) Use v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known while keeping distance versus displacement separate.
B. In the trolley ramp scenario, mix up distance versus displacement and ignore final velocity.
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 v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known.

Answer

The correct answer is: In the trolley ramp scenario, apply final velocity to (HT only) Use v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known while keeping distance versus displacement separate.

Explanation

The correct option is In the trolley ramp scenario, apply final velocity to (HT only) Use v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known while keeping distance versus displacement separate.. It is correct because the scenario says a trolley accelerates down a ramp while a timer records motion, which must be interpreted through Uniform acceleration (HT only). This directly supports the learning objective to (HT only) Use v^2 - u^2 = 2as to calculate initial velocity when final velocity, acceleration and distance are known. Use values 6, 9, and 21 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

Common Mistake in Calculating Initial Velocity

Students often confuse the variables in the equation v^2 - u^2 = 2as, mistakenly using final velocity as initial velocity.

Carefully identify each variable: ensure that final velocity (v) is used correctly and that initial velocity (u) is the unknown being calculated.

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