Question detail
If a car has a mass of 1000 kg and is moving at a speed of 20 m/s, calculate its kinetic energy.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
If a car has a mass of 1000 kg and is moving at a speed of 20 m/s, calculate its kinetic energy.
Answer
The kinetic energy is 200,000 joules. Using the equation Ek = 0.5 x m x v^2, we substitute m = 1000 kg and v = 20 m/s: Ek = 0.5 x 1000 x (20)^2 = 0.5 x 1000 x 400 = 200,000 J.
Explanation
This answer stays anchored to Changes in energy and uses the approved objective: Recall and apply the equation Ek = 0.5 x m x v^2..
Common mistake
Common Mistake in Kinetic Energy Calculation
Students often forget to square the speed (v) in the kinetic energy equation Ek = 0.5 x m x v^2.
Always remember to square the speed before multiplying by the mass and the 0.5 factor.
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