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A car has a mass of 8000 kg and a kinetic energy of 24 ,000 J.What is its speed? A. 3m/s B 2.4m/s c 1.7m/s D. 6m/s

Question

A car has a mass of 8000 kg and a kinetic energy of 24 ,000 J.What is its
speed?
A. 3m/s
B 2.4m/s
c 1.7m/s
D. 6m/s

A car has a mass of 8000 kg and a kinetic energy of 24 ,000 J.What is its speed? A. 3m/s B 2.4m/s c 1.7m/s D. 6m/s

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IsaiahElite · Tutor for 8 years

Answer

To find the speed of the car, we need to use the formula for kinetic energy, which is defined as the energy that a body possesses due to its motion. The formula for kinetic energy (KE) is \(KE = \frac{1}{2} m v^2\), where \(m\) is the mass and \(v\) is the velocity of the body.In this problem, we know that the kinetic energy (KE) is 24,000 J and the mass (m) is 8000 kg. We need to find the velocity (v).We can rearrange the kinetic energy formula to solve for velocity:\(v = \sqrt{\frac{2KE}{m}}\)Substituting the given values into the equation, we get:\(v = \sqrt{\frac{2 \times 24,000}{8000}}\)Solving this gives us \(v = 3\) m/s.So, the speed of the car is 3 m/s.Therefore, the correct answer is:【Answer】: A. \(3\) m/s.
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