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
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
A pendulum is oscillating on either side of its rest position. The correct statement is:
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
Name the device or machine which convert :
Light energy into electrical energy.
Name the device or machine which convert :
Electrical energy into light energy.
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
The device which converts mechanical energy into energy which runs our microwave oven is :
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
