SOLUTION: Use the equation for kinetic energy to show that velocity is more effective than mass in bringing a speeding car to a stop. (Hint: There is no need to calculate anything.

Question 1119885: Use the equation for kinetic energy to show that velocity is more effective than mass in bringing a speeding car to a stop. (Hint: There is no need to calculate anything. Use the relationships between the physical quantities in the equation for your explanation.)
Found 2 solutions by Boreal, math_helper:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
KE is proportional to the square of the velocity and to the first power of mass. Therefore, any change in the velocity is more effective at increasing or in this case decreasing the amount of energy than changing the mass.
Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!

Notice how the energy is proportional to the square of the velocity. So a small decrease in v results in a large decrease in . Reducing m is not practical in ordinary situations, and even so, it would only affect linearly.

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