Question detail

Forces and motion scenario: two trolleys collide and momentum is compared before and after. Which answer best addresses Uniform acceleration (HT only) and the objective to (HT only) Use v^2 - u^2 = 2as to calculate acceleration when velocities 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 collision scenario, apply acceleration to (HT only) Use v^2 - u^2 = 2as to calculate acceleration when velocities and distance are known while keeping distance versus displacement separate.
B. In the collision 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 v^2 - u^2 = 2as to calculate acceleration when velocities and distance are known.

Answer

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

Explanation

The correct option is In the collision scenario, apply acceleration to (HT only) Use v^2 - u^2 = 2as to calculate acceleration when velocities and distance are known while keeping distance versus displacement separate.. It is correct because the scenario says two trolleys collide and momentum is compared before and after, 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 acceleration when velocities and distance are known. Use values 6, 5, and 15 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 Acceleration

Students often confuse the variables in the equation v^2 - u^2 = 2as, leading to incorrect calculations of acceleration.

Ensure to clearly identify final velocity (v), initial velocity (u), and distance (s) before substituting into the equation.

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