Kinetic Energy - Practice Questions & MCQ

If mass-­energy equivalence is taken into account, when water is cooled to form ice, the mass of water should

Consider the following two statements

A         Linear momentum of a system of particles is zero.

B         Kinetic energy of a system of particles is zero.

Then

A mass of M kg is suspended by a weightless string . The horizontal force that is required to displace it until the string making an angle of 45^o  with the initial vertical direction is

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement  x is proportional to :

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that : 

A bullet looses of its velocity passing through one plank. The number of such planks that are required to stop the bullet can be :

A ball whose kinetic energy is ,  is projected at an angle of to the horizontal. The kinetic energy of the ball at the highest point of its flight will be

A particle is projected at 60⁰   to the horizontal with a kinetic energy . The kinetic energy at the highest point

An athlete of mass 50kg in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

A bomb of mass  16 kg at rest explodes into two pieces of masses of 4  Kg and 12 Kg.  The velocity of the 12 Kg mass is 4 ms^{-1 .} The kinetic energy (in joule) of the other mass is :