Question

If the total mechanical energy of a particle of mass m is E, its speed can be given as v=square root of 2(E-U )÷M
, where
U= potential energy function of the particle. Using the above expression find the speed of the particle
at earth's surface when the particle falls freely in gravity from rest from a height h = R, where
R = radius of earth. ​

Answer 1

Answer:

In physics, the kinetic energy (KE) of an object is the energy that it possesses due to its motion.[1] It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.