What is the velocity of a body of mass 100 g having a K.E. of 20 J?
2 ms-1
20 ms-1
40 ms-1
400 m/s
An object of mass 15 kg is moving with a uniform velocity of 4ms-1.What is the kinetic energy possessed by the object?
120 J
100 J
220 J
200 J
A steam engine converts :
Heat energy into sound energy
Heat energy into mechanical energy
Mechanical energy into heat energy
Chemical energy into mechanical energy
When the speed of a moving object is doubled, its
Acceleration is doubled
Weight is doubled
K.E.is doubled
K.E.becomes 4 times
Which of the following graphs closely represents the kinetic energy (k) of a freely falling body and its height (h) above the ground?
Which of the following graphs best represents the total energy (T) of a freely falling body and its height (h) above the ground?
What are the conditions that would satisfy to reveal work is done?
A force should act on an object
The object must be displaced
Both 'a' and ;'b'
a only
A body is dropped from a certain height from the ground. When it is half way down,it possess :
Only K.E.
Both K.E and P.E
Only P.E
Zero energy
Kgm2 s-2 represents the unit of
Kinetic energy
Work done
Potential energy
All the above
A body is thrown vertically up from the earth's surface. What happened to its P.E. during the motion?
Increases
Decreases
Remains constant
First increases then decreases
