Laws of Motion - Result Question 45

45. 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

[2007]

(a) gμ/V

(b) g/V

(c) V/g

(d) V/(gμ).

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Answer:

Correct Answer: 45. (d)

Solution:

  1. (d) Friction is the retarding force for the block

F=ma=μR=μmg

Therefore, from the first equation of motion

v=uat

0=Vμg×tVμg=t



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