Advertisements
Advertisements
Question
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
Advertisements
Solution
Total energy of a free falling object remains conserved.
So,
Kinetic energy at the ground = Potential energy at the top = 80 J
APPEARS IN
RELATED QUESTIONS
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
Is energy a vector quantity?
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
A bulb lights up when connected to a battery. State the energy change which takes place :
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
How much energy does a 100 W electric bulb transfer in 1 minute?
A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 s is
