A mass moves in a circle of radius at a constant speed of . What is the centripetal force (in N)?

Answer and explanation

Correct answer: D. 20

  1. Step 1: State the centripetal force formula for an object of mass executing uniform circular motion with radius and speed : .
  2. Step 2: Substitute , , and : .
  3. Step 3: Compute the force: .
Answer
20.
Why not the others: The alternative options (50, 2, 100) omit the factor of in kinetic energy or confuse momentum with kinetic energy.

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