Question

calculate the potential energy of an object of mass 50 kg is raised to a height of 4 metre above the ground .if the object Falls down, what is the kinetic energy when it has fallen 2 metre​

Answer 1

The kinetic energy when it has fallen 2 meter is ​979.69 J.

Explanation:

It is given that,

Mass of the object, m = 50 kg

The object is taken to a height of 4 meters above the ground.

Let P is the potential energy of the object. It is associated with the position of an object. It is given by :

$P=mgh$

$P=50\times 9.8\times 4$

P = 1960 J

We need to find the kinetic energy of the object when it has fallen 2 meter. Let v is the final speed of the object. Firstly, it is required to find it as :

$v^2-u^2=2as$

a = g and u = 0

​$v^2=2gs$

​$v^2=2\times 9.8\times 2$

v = 6.26 m/s

Kinetic energy of the object when it has fallen 2 meters is :

$K=\dfrac{1}{2}mv^2$

$K=\dfrac{1}{2}\times 50\times (6.26)^2$

K = 979.69 J

So, the kinetic energy when it has fallen 2 meter is ​979.69 J. Hence, this is the required solution.

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Kinetic and Potential energy

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Answer 2

Answer:

A body of mass 50 kg is raised to a hight of 3m what is the potential energy