JEE Main 2018 — Laws Of Motion Question with Solution
From: JEE Main 2018 (Online) 15th April Morning Slot
Question
A given object takes n times more time to slide down a rough inclined plane as it takes to slide down a perfectly smooth incline. The coefficient of kinetic friction between the object and the incline is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Let, t1 and t2 are time taken to move on the smooth and rough surface for smooth surface,
S = g sin45o
t1 =
For rough surface,
S = g (sin45o k cos45o)
t2 =
Here = Kinetic friction.
According to question,
t2 = n t1
= n2
1 k =
= 1
S = g sin45o
t1 =
For rough surface,
S = g (sin45o k cos45o)
t2 =
Here = Kinetic friction.
According to question,
t2 = n t1
= n2
1 k =
= 1
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This is a previous-year question from JEE Main 2018, covering the Laws Of Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.