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dezoksy [38]
3 years ago
9

At what speed must a 950-kg subcompact car be moving to have the same kinetic energy as a 3.2×104−kg truck going 20 km/h?

Physics
1 answer:
Ostrovityanka [42]3 years ago
6 0

<u>Answer:</u>

 950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

<u>Explanation:</u>

  Kinetic energy of body with mass m and moving at velocity v is given by

                  KE=\frac{1}{2} mv^2

  KE of truck  = \frac{1}{2}*3.2*10^4*20^2

  KE of subcompact car = \frac{1}{2}*950*v^2

  Equating

         \frac{1}{2}*3.2*10^4*20^2= \frac{1}{2}*950*v^2\\ \\ v=116.08 km/hr

 So 950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

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