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The kinetic Energy has to be the same as the Energy with which the spring was stratched:
1/2×m×v^2=1/2×D×s^2
Ekin=1/2×440×0.3^2= 1/2×440×0.09=19.8. ( Of course, the kinetic Energy is normally Not calculated Like this , but in this case both Formulas have the Same solution so you can Wright it Like This)
By the way, if the spring Had Not reached its Natural length yet, you wouldnt be right if you calculate it Like above, because a Part of the Energy is still in the spring : Espring=Ekin+Espring2
The kinetic energy of an object increases as its velocity increases. Moreover, we see that the braking distance of the car increases as its velocity increases. Therefore, the breaking distance increases when the kinetic energy of the car is higher. This is evident in the graph where when the velocity is lower, the kinetic energy is lower and the braking distance is less.
Answer:
The answer is 80 m/s
Explanation:
You divide 240 by 3 since your force is 240N, then 3 is your mass, so divide and get 80
