NEETPhysicsWork, Power and Energy
Statement I A block of mass m starts moving on a rough horizontal surface with a velocity v . It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 30^ with the horizontal and the same block is made to go up on the surface with the same initial velocity v . The decrease in the mechanical energy in the second situation is smaller th
Options
- AStatement I is true, Statement II is true; Statement II is a correct explanation for Statement I
- BStatement I is true, Statement II is true; Statement II is NOT a correct explanation for Statement I
- CStatement I is true, Statement II is false
- DStatement I is false, Statement II is true
Correct answer
C. Statement I is true, Statement II is false
Step-by-step solution
In statement I Decrease in mechanical energy in case I will be U₁= 1 2 m v^2 But decrease in mechanical energy in case II will be aligned & U₂= 1 2 m v^2-m g h & U₂ < U₁ aligned U₂ < U₁ or Statement I is correct. In Statement II Coefficient of friction will not change or this Statement is wrong. Option (c) is correct.