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1.
A coolie 1.5 m tall raises a load of 80 kg in 2 s from the ground to his head and then walks a distance of 40 m in another 2 s. The power developed by the coolie is 
2.
A rubber ball is dropped from a height of 
on a planet where the acceleration due to gravity is not known. On bouncing, it rises to
. The ball loses its velocity on bouncing by a factor of
on a planet where the acceleration due to gravity is not known. On bouncing, it rises to. The ball loses its velocity on bouncing by a factor of
3.
Power of water pump is 
. If 
, the amount of water it can raise in one minute to a height of 
is
. If , the amount of water it can raise in one minute to a height of is
4.
A 
motor pumps out water from a well of depth 
and fills a water tank of volume 
at a height of from the ground. The running time of the motor to fill the empty water tank is (
)
motor pumps out water from a well of depth and fills a water tank of volume at a height of from the ground. The running time of the motor to fill the empty water tank is ()
5.
The bodies of masses 
and 
are dropped gently from the top of a tower. At a point 
from the ground, both the bodies will have the same
and are dropped gently from the top of a tower. At a point from the ground, both the bodies will have the same
6.
A force of 
, making an angle 
with the horizontal, acting on an object displaces it by 
along the horizontal direction. If the object gains kinetic energy of 
, the horizontal component of the force is
, making an angle with the horizontal, acting on an object displaces it by along the horizontal direction. If the object gains kinetic energy of , the horizontal component of the force is
7.
Two rectangular blocks 
and 
of masses 2kg and 3 kg respectively are connected by spring of spring constant 10.8 
and are placed on a frictionless horizontal surface. The block was given an initial velocity of 0.15 
in the direction shown in the figure. The maximum compression of the spring during the motion is
and of masses 2kg and 3 kg respectively are connected by spring of spring constant 10.8 and are placed on a frictionless horizontal surface. The block was given an initial velocity of 0.15 in the direction shown in the figure. The maximum compression of the spring during the motion is
8.
The relation between the displacement 
of an object produced by the application of the variable force 
is represented by a graph shown in the figure. If the object undergoes a displacement from 
to 
the work done will be approximately equal to
of an object produced by the application of the variable force is represented by a graph shown in the figure. If the object undergoes a displacement from to the work done will be approximately equal to
9.
A particle free to move along the 
-axis has potential energy given by 
for 
, where 
is a positive constant of appropriate dimensions. Then
-axis has potential energy given by for , where is a positive constant of appropriate dimensions. Then
10.
A mass of 50 kg is raised through a certain height by a machine whose efficiency is 90%, the energy is 5000 J. If the mass is now released, its KE on hitting the ground shall be