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1.
A body of mass 2 kg is projected at 20
at an angle 
above the horizontal. Power Due to the gravitational force at its heights point is
at an angle above the horizontal. Power Due to the gravitational force at its heights point is
2.
When a spring is stretched by 
, it stores 
of energy. If it is stretched further by , the stored energy will be increased by
, it stores of energy. If it is stretched further by , the stored energy will be increased by
3.
A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 ft tall building. After a fall of 30 ft each towards earth ,their respective kinetic energies will be in the ratio of
4.
A particle is released from a height 
. At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively
. At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively
5.
A 
ball is thrown up with an initial speed 
and reaches a maximum height of 
. How much energy is dissipated by air drag acting on the ball during the ascent
ball is thrown up with an initial speed and reaches a maximum height of . How much energy is dissipated by air drag acting on the ball during the ascent
6.
A billiard ball moving with a speed of 
collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of
collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of
7.
A body of mass 5 kg is thrown vertically up with a kinetic energy of 490 J. The height at which the kinetic energy of the body becomes half of the original value is
8.
The potential energy of a 
particle free to move along the 
-axis is given by
The total mechanical energy of the particle is 
. Then, the maximum speed (in 
) is
particle free to move along the -axis is given by The total mechanical energy of the particle is . Then, the maximum speed (in ) is
9.
If the unit of force and length each be increased by four times, then the unit of energy is increased by
10.
A body of mass 
is placed at the origin, and can move only on the x-axis. A force of 
is acting on it in a direction making an angle of with the x-axis and displaces it along the x-axis by 
. The work done by the force is
is placed at the origin, and can move only on the x-axis. A force of is acting on it in a direction making an angle of with the x-axis and displaces it along the x-axis by . The work done by the force is