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Question

A block of mass 3 kg is at rest on a rough inclined plane as shown in the figure. The magnitude of net force exerted by the surface on the block will be (g=10 m/s2)


Your Answer
A
26 N
Your Answer
B
19.5 N
Your Answer
C
10 N
Correct Answer
D
30 N

Solution

The correct option is D 30 N
As the block is at equilibrium
N=mgcos30=153 N
f=mgsin30=15 N


Total contact force =(153)2+(15)2=30 N

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