What is the kinetic energy (in J) of a body moving at ?

Answer and explanation

Correct answer: B. 90

  1. Step 1: The kinetic energy of a body in translational motion is given by .
  2. Step 2: Substitute mass and velocity : .
  3. Step 3: Evaluating the expression gives .
Answer
90.
Why not the others: 180 computes forgetting the factor; 45 halves the correct kinetic energy; 30 computes momentum .

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