KVPY2012PhysicsWork, Power and Energy
A block of mass m is sliding down an inclined plane with constant speed. At a certain instant t ₀ , its height above the ground is h . The coefficient of kinetic friction between the block and the plane is . If the block reaches the ground at a later instant t _ g , then the energy dissipated by friction in the time interval ( t _ g - t ₀ ) is-
Options
- Amgh
- Bmgh /
- Cmgh )
- Dmgh /
Correct answer
C. mgh )
Step-by-step solution
array l W _ f + W _ mg = K . E .,( K . E =0) W _ f =- W _ mg W _ f =- mgh Energy dissipated = mgh array