Question

A 5 Kg block (A) is placed on 10 Kg block (B) which is at rest on the table.Coefficient of the  friction between (A) & (B) 0.3 and between (B) & table is 0.4 .A 40 N horizontal force is applied on the block (B) , then the friction force between the block (A)  & (B) is :

A

0

B

15 N

C

60 N

D

40 N

Hard

Solution

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Correct option is A)
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