Q. A block B is pushed momentarily along a horizontal surface with an initial velocity V. If μ is the coefficient of sliding friction between B and the surface, block B will come to rest after a time
A) gμ/V
B) g/V
C) V/g
D) V/(gμ)
Explanation
[Solution from source] Friction gives a deceleration μg, so the block stops when V − μgt = 0, i.e. t = V/(μg). V/g ignores the friction coefficient. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.