Question Text
Question 1 :
Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force.
Question 2 :
Can there be displacement of an object in the absence of any force acting on it?
Question 3 :
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? $(g = 10 m s^{–2})$
Question 4 :
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. How much work is done by the men in lifting the box? $(g=10 ms^{-2})$
Question 6 :
The unit of energy and work
called joule, is named after James Prescott Joule.
Question 7 :
A certain household has consumed 250 units of energy during a month. How much energy is this in joules?
Question 8 :
An object of mass m is moving with a constant velocity v. How much work should be done on the object in order to bring the object to rest?
Question 9 :
The kinetic energy of an object of mass m moving with a velocity of 5 $\frac{m}{s}$ is 25 J. What will be its kinetic energy when its velocity is doubled?
Question 10 :
A body is falling from a height h. After it has fallen a height $\frac{h}{2}$ , it will possess