work,energy

A particle is thrown upward with some kinetic energy. What happened to its kinetic energy at the highest point or height it reaches

• Its kinetic energy is lost

• It's all kinetic energy is absorbed by the air

• Its kinetic energy is converted to potential energy

• Its kinetic energy is remain same

During inelastic collision between two bodies, which of the following quantities always remain conserved?

• Total kinetic energy.

• Total mechanical energy.

• Speed of each body

• Total linear momentum.

Expression for Power of an object is equal to:

• Power = Work done X Time

• Power = Time/ Work done

• power=force/velocity

• Power = Work done/Time

In hydro electricity generation, water stored in a dam possesses:

• electrical energy

• potential energy

• thermal energy

• chemical energy

An object is thrown vertically upward and it reaches to a maximum height 'h' from the ground. During its flight, on reaching 3/4 of height H, it will acquire?

• less potential and high kinetic energy

• more potential and less kinetic energy

• only kinetic energy

• only potential energy

A vector quantity has both magnitude as well as direction, where as a scalar quantity has only magnitude and no direction. which of the given below is a scalar quantity?

• Velocity

• force

• work done

• momentum

In Force vs Displacement graph, What does the area under the curve represents

• Velocity

• power

• force

• work

When a spring is compressed or stretched beyond its natural position by applying some force, work is done on it. Its elastic potential energy

• increases

• Decreases

• Disappears

• Does not change

Two objects A and B are moving with same momentum. Mass of object 'B' is greater then mass of object 'A'. Which of the two object will have higher kinetic energy?

• Object B

• Object A

• Both the objects will have same Kinetic Energy

• Object with greater mass will have higher kinetic energy

Find the work done by the force F on the body in the diagram

•  $F\Delta x$  

•  $-F\Delta x$  

•  $Zero$  

•  $mg\Delta x$