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An object has a kinetic energy of 810 J after falling a certain distance. If the mass of the object is 20kg, what is the speed of the object at this time? I need the equation and answer please!
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An object has a kinetic energy of 810 J after falling a certain distance. If the mass of the object is 20kg, what is the speed of the object at this time?

I need the equation and answer please!

User Wintvelt
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7.9k points

2 Answers

7 votes

Answer: 810 J / 1/2 (20 kg) = 9m/s

Step-by-step explanation:

User AWT
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9.0k points
5 votes
Don't let the "falling" confuse you. A moving object's kinetic energy is

K.E. = 1/2 (mass) (speed^2)

no matter what direction it's moving, or why.

In this problem, you know the KE and the mass, so

810 J = 1/2 (20 kg) (speed^2).

I think you can probably find the speed now.
User Nikita Kazantsev
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8.2k points
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