Advertisements
Advertisements
Question
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Advertisements
Solution
The kinetic energy at the highest point is zero because at the highest point, velocity of the high jumper becomes zero.
APPEARS IN
RELATED QUESTIONS
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.
Define the term 'energy' of a body. What is the SI unit of energy.
Water stored in a dam possesses :
Name the device or machine which convert :
Chemical energy into electrical energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
A microphone converts :
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)
