QJEEM15Ph069e: JEE Main 2015 Physics - Class 11 JEEM15Ph069e Solution: Given in the figure are two blocks and of weight 20 N and 100…

Question

Verified Solution • 2025–26 Session moderate

Given in the figure are two blocks

A

and

B

of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force

F

as shown. If the coefficient of friction between the blocks is 0.1 and between block

B

and the wall is 0.15, the frictional force applied by the wall on block

B

is :

Accepted Answer

Assuming both the blocks are stationary

From the F.B.D of both the blocks we can find,

N=F

f¹ = 20 N

f² = 100 + 20 = 120 N

JEE Main 2015 (Offline) Physics - Laws of Motion Question 112 English Explanation 2

Considering those two blocks as one system and due to equilibrium

f=120N

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