JEE Main2012PhysicsLaws of MotionActual
An engine pumps water continuously through a hose. Water leaves the hose with velocity v and m is mass per unit length of the water jet. If this jet hits a surface and came to rest instantaneously, the force on the surface is
Options
- Am v^3
- Bm v^2
- C1 2 m v^2
- D1 2 m v^3
Correct answer
B. m v^2
Step-by-step solution
As power P =F . v .= F t aligned & or, v (M v t )= F . t & M v^2=F & F= M v^2=m v^2 & [ M =m( given ) ] aligned