KCET2012PhysicsWork, Power and Energy
A body of mass m is travelling with a velocity u . When a constant retarding force F is applied, it comes to rest after travelling a distance s₁ . If the initial velocity is 2 u , with the same force F , the distance travelled before it comes to rest is s₂ . Then,
Options
- As ₂=4 ~s ₁
- Bs ₂=2 ~s ₁
- Cs₂= s₁ 2
- Ds₂=s₁
Correct answer
A. s ₂=4 ~s ₁
Step-by-step solution
By work energy theorem, and Fs ₂= 1 2 ~m (2 x )² From Eqs. (i) and (ii), s₂=4 s₁