MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
What is the maximum kinetic energy of the car?
Think it through first, then pick an option.
- a 2 × 10⁴ J
- b 4 × 10⁴ J
- c 8 × 10⁵ J
- d 16 × 10⁷ J
Answer and explanation
Correct answer: c 8 × 10⁵ J
The table shows a top speed of 40 m/s, and kinetic energy is largest at top speed: T = ½mv² = ½ × 1000 × 40² = 8 × 10⁵ J. Forgetting to square the velocity gives 2 × 10⁴ J.
Why the other options are wrong
- a 2 × 10⁴ J: This is not the answer: The table shows a top speed of 40 m/s, and kinetic energy is largest at top speed: T = ½mv² = ½ × 1000 × 40² = 8 × 10⁵ J. Forgetting to square the velocity gives 2 × 10⁴ J.
- b 4 × 10⁴ J: This is not the answer: The table shows a top speed of 40 m/s, and kinetic energy is largest at top speed: T = ½mv² = ½ × 1000 × 40² = 8 × 10⁵ J. Forgetting to square the velocity gives 2 × 10⁴ J.
- d 16 × 10⁷ J: This is not the answer: The table shows a top speed of 40 m/s, and kinetic energy is largest at top speed: T = ½mv² = ½ × 1000 × 40² = 8 × 10⁵ J. Forgetting to square the velocity gives 2 × 10⁴ J.
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