What is the kinetic energy of a projectile moving at a velocity of ?
Answer and explanation
Correct answer: A.
- Step 1: Kinetic energy formula is .
- Step 2: Substitute values: .
- Step 3: Calculate: .
Answer
400\text{ J}.
Why not the others: '' calculates momentum without squaring velocity (); '' divides by 4; '' forgets the factor of .
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