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
Kinetic energy is measured in joules
Joules, as energy is measured in joules.
Joules, all energy is measured in joules.
joules
27 Joules
Joules, all energy is measured in joules.
Kinetic energy is measured in the units of joules. Mostly all energy units are measured in joules.
As the object falls, it PEG or potential gravitational energy becomes kinetic energy. Before falling, it has for example 10 joules of PEG and 0 joules of Kinetic energy. As it falls, the PEG decreases and the kinetic energy increases, until it hits the ground, when all the energy is dispersed as sound, heat, etc.
From what I understand: PE - Potential Energy (mgh) KE - Kinetic Energy (1/2 mv2) If one dismisses the friction with air (conservation of energy), a loss of 7 joules for potential energy means a gain of 7 Joules in kinetic energy.
Joules (J)
joules
Kinetic energy is measured in (J) Joules. J=Kgm2/S2