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Grade: 11


The time taken by a body to slide down a rough 45 degrees inclined plane is twice that required to slide down a smooth 45 degrees inclined plane.the coefficent of friction between the object and rough plane is given by : a. 1/3 b. 3/4 c. root 3/4 d. root 4/3 rply pls...

11 years ago

Answers : (3)

Badiuddin askIITians.ismu Expert
147 Points

hi rohan bhatia





accelarion along the downward direction of wedge



let total time taken is t

s=0*t +.5(a1)t^2

 when wedge is frictionles

then acceleration


s=0*t/2 +.5(a2)*(t/2)^2

equate both value of s


Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
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Askiitians Experts

11 years ago
manoj jangra
8 Points

hey ans is 3/4

when you compare

let x be length of the wedge

X = 1/2 gsinθ t2           for smooth plane

X = 1/2 (gsinθ-μcosθ)4t2    foe rough plane

you will get ams 3/4

11 years ago
rohan bhatia
18 Points

thank u very much sir for solving my problems.

q. a block of mass m is resting on a wedge of angle θ with what minimum acceleration a should the wedge move so that the mass m falls freely ?

11 years ago
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