0
An object has a kinetic energy of 810 j after falling a certian distance if the mass of the object is 20 kg what is the speed of the object at this time?
Wiki User
∙ 13y ago
The formula for kinetic energy, Ek, could not be simpler.
Ek = (1/2)mv2, where m is mass (in kg) and v is velocity (in m s-1). If you prefer, you could write Ek = mv2/2.
or, 810j=1/2*20Kg*v2
or,v2=810j*2/20Kg
or,v=sqrt of 81
so,v=9m s-1
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoKinetic energy = 1/2 m v2
810 = 1/2 (20) v2
v2 = 810/10 = 81
v = sqrt(81) = 9 meters per second
Add your answer:
Earn +20 pts
What happens the the kinetic energy of a falling object?
If the object's falling energy increases (this would happen if the object is already falling downward, and air resistance is small), then the kinetic energy will increase.
What form of energy is a falling rock?
That is a trick question, but I believe it is kinetic energy.
A boulder falling through the air has what type of energy?
a boulder falling through the air still has some potential energy, but some of its potential energy has changed to kinetic energy...so it has both potential and kinetic!
What is the energy in an object about to fall?
the energy in an object about to fall is potential energy then kinetic energy because when the object is not falling, it has potential energy but when it's actually falling, it has kinetic energy.
A falling rock has kinetic energy?
True.
What kind of energy do falling boulders have?
Kinetic energy.
What happens the the kinetic energy of a falling object?
If the object's falling energy increases (this would happen if the object is already falling downward, and air resistance is small), then the kinetic energy will increase.
What is the distance between kinetic and potential energy?
Kinetic and potential energy are a type of energy, not a measurement of distance.
Is a falling ball potential or kinetic energy?
it is kinetic because it involves releasing the energy.
What form of energy is a falling rock?
That is a trick question, but I believe it is kinetic energy.
A boulder falling through the air has what type of energy?
a boulder falling through the air still has some potential energy, but some of its potential energy has changed to kinetic energy...so it has both potential and kinetic!
Is an increase in kinetic energy directly proportional to the time it takes for an object to fall slash distance it falls?
The kinetic energy of a falling object is directly proportional to the distance it falls.But the distance is not directly proportional to the time in fall, so the KE is not directly proportionalto the time either.
What is energy possessed by moving or falling bodies?
kinetic energy
What is energy from potenttial energy kinetic energy would be what?
A falling rock. In the air it has potential energy, as it falls it gets kinetic energy.
What is the energy in an object about to fall?
the energy in an object about to fall is potential energy then kinetic energy because when the object is not falling, it has potential energy but when it's actually falling, it has kinetic energy.
A falling rock has kinetic energy?
True.
Why can an object have kinetic energy and potential energy?
Because they are not mutually exclusive. Take for example a falling object; while falling at a given velocity it has (.5)(mass)(velocity)2=Kinetic Energy but also has the potential energy of whatever distance it has yet to fall, which equals (mass)(gravity)(height)=Potential Energy These two types of energy equal the Total Energy of the falling object, which never changes as it falls.
