What is the kinetic energy (in J) of a body moving at ?
Answer and explanation
Correct answer: A. 180
**
- Step 1: Kinetic energy is defined as .
- Step 2: Setting and , write .
- Step 3: The calculated energy is .
Answer
180.
Why not the others: '90' adds rather than subtracts the constant term in the final step in evaluating ; '360' omits the factor of , calculating ; '60' computes linear momentum rather than kinetic energy.
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