Question

An object of mass 30 kg is raised to a height of 10 m above the ground calculate its potential energy.what is its potential energy when the object is 7 m above ttheground

Answer 1

Answer:

Potential energy (U) is given by the expression,

U= mgh

Where,

m = Mass of the object

h = Vertical displacement

g = Acceleration because of gravity = 9.8 ms-2

W= 40 X 9.8 X 5

W= 1960 J

At half-way down, the Kinetic energy of the item are going to be

At this time, the item has an equal quantity of potential and K.E.

This can be due to law of conservation of energy. Hence, half-way down, the K.E. of the object can be calculated as

1960 J/ 2 = 980 J

half way down = 980 J