MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
An object of mass 5 kg is thrown vertically upward at 50 m s⁻¹. What will its mechanical energy be at the highest point?
Think it through first, then pick an option.
- a 3150 J
- b 6250 J
- c 12,500 J
- d 25,000 J
Answer and explanation
Correct answer: b 6250 J
At launch the potential energy is 0 and the kinetic energy is ½ × 5 × 50² = 6250 J. Mechanical energy (kinetic + potential) is conserved, so at the highest point it is still 6250 J, all of it potential energy.
Why the other options are wrong
- a 3150 J: This is not the answer: At launch the potential energy is 0 and the kinetic energy is ½ × 5 × 50² = 6250 J. Mechanical energy (kinetic + potential) is conserved, so at the highest point it is still 6250 J, all of it potential energy.
- c 12,500 J: This is not the answer: At launch the potential energy is 0 and the kinetic energy is ½ × 5 × 50² = 6250 J. Mechanical energy (kinetic + potential) is conserved, so at the highest point it is still 6250 J, all of it potential energy.
- d 25,000 J: This is not the answer: At launch the potential energy is 0 and the kinetic energy is ½ × 5 × 50² = 6250 J. Mechanical energy (kinetic + potential) is conserved, so at the highest point it is still 6250 J, all of it potential energy.
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