This required practical covers Worked Example: Finding Speed from KE within Kinetic Energy for GCSE Physics. Revise Kinetic Energy in Energy for GCSE Physics with 15 exam-style questions and 30 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 7 of 15 in this topic. Revise both the method and the reason for each step, because practical questions often test understanding rather than pure recall.
🔬 Worked Example: Finding Speed from KE
Question: A 1500 kg car has kinetic energy of 675,000 J. Calculate its speed.
Step 1: Write the equation
Ek = ½mv²
Step 2: Substitute known values
675,000 = ½ × 1500 × v²
Step 3: Simplify
675,000 = 750 × v²
Step 4: Rearrange for v²
v² = 675,000 ÷ 750 = 900
Step 5: Square root to find v
v = √900 = 30 m/s
💡 Check: Does ½ × 1500 × 30² = 675,000? Yes! ✓
Practice questions for Kinetic Energy
Which of the following objects has kinetic energy stored in its kinetic energy store?
A car travels at 20 m/s. The driver then doubles their speed to 40 m/s. Explain what happens to the kinetic energy of the car and by what factor it changes.