AP EAMCET202423 May 2024Morning ShiftPhysicsLaws of MotionActual
A particle of mass ' m ' at rest on a rough horizontal surface with a coefficient of friction ' ' is given a velocity ' u '. The average power impaired by friction before it stops
Options
- AZero
- B1 2 m g u
- Cm g u
- D2 m g u
Correct answer
B. 1 2 m g u
Step-by-step solution
Acceleration of block, aligned & a= -f_r m = - m g m & a=- m aligned Time to stop, t = u - a = m g By work - energy theorem, W _ f = k =0- 1 2 mu ^2=- 1 2 mu ^2 Power, P _ ar = | W _ f | t = 1 2 mu ^2 u g = 1 2 mgu