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. 16/5

  1. Step 1: The centripetal force required to sustain circular motion of radius at tangential speed is given by .
  2. Step 2: Substitute mass , radius , and velocity : .
  3. Step 3: Calculating the terms yields .
Answer
16/5.
Why not the others: 16 calculates without dividing by radius ; 20 computes the product ; 4/5 forgets to square the speed ().

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