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rhiannonweik2000
29.12.2021 •
Physics
a car starts at rest and speeds up at 3.5 m/s^ after the traffic light turns green. how far will it have gone when it is going 25 m/s?
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Ответ:
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