wiz-icon
MyQuestionIcon
MyQuestionIcon
7
You visited us 7 times! Enjoying our articles? Unlock Full Access!
Question

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

Open in App
Solution

Gravitational potential energy is given by the expression, P.E= mgh
where, h is the vertical displacement = 5 m
m is the mass of the object = 40 kg
g is the Acceleration due to gravity = 9.8 ms2
P.E=40×5×9.8=1960 J.
At half-way down, the potential energy of the object will be 19602=980 J.
At this point, the object has an equal amount of potential and kinetic energy.
This is due to the law of conservation of energy.
Hence, half-way down, the kinetic energy of the object will be980 J.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Why Conservation of Energy?
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon