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parameters given are :
mass(m)=20kg
height(h)=30m
acceleration due to gravity(g)=9.8m/s squared
But K.E=1/2MV`2 = mgh = 20x9.8x30 =5880 joules or 5.88 kilo-joules.
Nadia Heidenreich
Wiki User
∙ 14y agoThe kinetic energy of an object is given as .5mv2, where m is the mass of the object, and v is the velocity of the object. So in this case, we can't determine the kinetic energy directly, but we can determine the potential energy, which is given by mgh, where m is the mass, g is the gravitaional constant, and h is the height above the ground that the object falls from. We know that all of the potential energy is going to be converted into kinetic energy. So mgh = .5mv2. (20 kg)(9.8 m/s2)(30 m)= 5880J
Wiki User
∙ 13y agoparameters given are :
mass(m)=20kg
height(h)=30m
acceleration due to gravity(g)=9.8m/s squared
But K.E=1/2MV`2 = mgh = 20x9.8x30 =5880 joules or 5.88 kilo-joules.
Anonymous
Wiki User
∙ 13y agovf2=vi2+2ad
Ek=1/2mv2
vf**2=0+2(9.81m/s**2)(30)
vf**2=588.6
Ek=0.5*20*588.6
Ek=5886 joules
Wiki User
∙ 9y ago. . . at 22.7m/s
Wiki User
∙ 11y ago9m/s
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What is a kinetic energy of an object that has a mass of 20 kilograms and a speed of 2.8 ms?
IKE = ½mv² = ½ × 20 kg × (2.8 m/s)² = 78.4 kgm²/s² = 78.4 J.
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?
Kinetic energyThe 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*v2or,v2=810j*2/20Kgor,v=sqrt of 81so,v=9m s-1
Define kinetic energy in terms of temperature?
The reverse is usually done .... Define temperature in terms of KE. The temperature of a body is proportional the the average Kinetic Energy of the particles (molecules or atoms) that make up the body. Can't be done the other way because a car traveling at 60 miles per hour has Kinetic energy which has nothing to do with temperature. The car doesn't care if is 100 degrees or 20 degrees.
Which would have greater effect on kinetic energy of an object - doubling the mass or doubling the velocity?
Doubling mass affects kinetic energy in that the greater the mass, the greater the kinetic energy. OK, but if you have a 10kg mass traveling at 2m/s and it bumps into and sticks to a 10g mass, the resultant speed would be 1m/s. The momentum stays the same. KE before is 10*2*2/2= 20, while the KE after is 20*1*1/2= 10. So it is not that the above answer is wrong, but rather, you question is not clear.
If the speed of a moving object is doubled the kinetic energy of the object is?
The relation between kinetic energy is proportional to the square of velocity. Momentum is directly proportional to velocity. If the momentum of an object is doubled, but its mass does not increase (so velocity remains well below the speed of light), then its velocity is doubled. If the velocity is doubled then the kinetic energy increases by the square of 2, or four time.
What is the kinetic energy of an object that has a mass of 20 kg and a speed of 2.8m per second?
The object's kinetic energy is 78.4 joules.
What is the kinetic energy of an object that has a mass of 20 kilograms and a speed of 2.8ms?
A. 56 j
What is the kinetic energy of an object with a mass of 30kg and a velocity of 20 ms?
6,000 J
What is the kinetic energy of an object that has mass if 30 kilograms moves with a velocity of 20 mm?
To get the kinetic energy of an object you need both mass and velocity. As it stands it can't be answered, as "mm" isn't a recognized unit of velocity
What is a kinetic energy of an object that has mass of 20 kilograms and speed of 2.8ms?
78.4 joules at 2.8m/s
What is the kinetic energy of an object that has a mass of 20 kg and a speed of 2 point 8 m per s?
Kinetic Energy = 1/2 m V2 = 1/2 (20) (2.8)2 = 78.4 joules
If an object weighing 90 kilograms and moving with a velocity of 20 meters per second has a kinetic energy of 4500 Joules. what is its kinetic energy when the velocity is 32 meters per second?
KE=(1/2)mv246080 Joules
What is a kinetic energy of an object that has a mass of 20 kilograms and a speed of 2.8 ms?
IKE = ½mv² = ½ × 20 kg × (2.8 m/s)² = 78.4 kgm²/s² = 78.4 J.
A certain pendulum has a potential energy of 20 J when it is at the top of its swing. What is the kinetic energy?
If at the top of the swing the pendulum is STOPPED then it has zero kinetic energy.
What is the kinetic energy of an object that has a mass of 20 kilograms and a speed of?
I know this isn't technically 'correct', but the answer for this penn foster question that will make you get a 'correct' to pop up, is strangely A.
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?
Kinetic energyThe 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*v2or,v2=810j*2/20Kgor,v=sqrt of 81so,v=9m s-1
What is the kinetic energy of an object that has a mass of 20 kilograms and a speed of 2.8 m per s?
KE = 1/2 M V2 = 1/2 (20) (2.8)2 = 78.4 joules
