What is the kinetic energy (in J) of a body moving at ?
Answer and explanation
Correct answer: D. 45
- Step 1: The kinetic energy of a body in translational motion is given by .
- Step 2: Substitute mass and velocity : .
- Step 3: Evaluating the expression gives .
Answer
45.
Why not the others: 90 computes forgetting the factor of ; 30 computes momentum ; 22 is an arithmetic error.
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