A mass moving horizontally (along the -axis) with velocity collides and sticks to mass of moving vertically upward (along the -axis) with velocity . The final velocity of the combination is
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As the two masses stick together after collision, hence it is inelastic collision. Therefore, only momentum is conserved.
A body of mass moving with velocity collides head on with another body of mass which is initially at rest. The ratio of . . of colliding body before and after collision will be
K. E. of colliding body before collision After collision its velocity becomes
K. E. after collision
Ratio of kinetic energy
An object of mass makes an elastic collision with another object of mass at rest and continues to move in the original direction but with one-fourth of its original speed. What is the value of M?
None of these
For the object of mass .
Kinetic energy transferred
Here,
or
A bullet of mass and moving with collides with a block of mass hanging with the string. What is velocity of bullet when it comes out of block, if block rises to height
after collision?
Initial, K.E.
Change in K.E. P.E.
A block of mass is moving with a speed of on a smooth surface. It strikes another mass of and then they move together as a single body. The energy loss during the collision is
Initial kinetic energy of the system
For collision, applying conservation of linear momentum
Final kinetic energy of the system is
Energy loss during collision
If a shell fired from a cannon, explodes in mid air, then
its total kinetic energy increases
its total momentum increases
its total momentum decreases
As the floor exerts a force on the ball along the normal, & no force parallel to the surface, therefore the velocity component along the parallel to the floor remains constant. Hence .
Before a rubber ball bounces off from the floor, the ball is in contact with the floor for a fraction of second. Which of the following statements is correct?
Conservation of energy is not valid during this period
Conservation of energy is valid during this period
As ball is compressed, kinetic energy is converted to compressed potential energy
The law of conservation of energy is valid at any instant & in all circumstances.
A bag of sand of mass is suspended by a rope. A bullet of travelling with speed gets embedded in it, then loss of kinetic energy will be
14.7
As no external force is acting on system so,
Loss in K.E.
A object of mass collides with another object of mass , which is at rest. After the collision the objects move with equal speeds in opposite direction. The ratio of the masses is:
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