Question

Step 1

(a)

Consider the FBD of the block as shown.

Step 2

Here, *N* is the normal reaction force that acts on the block and *f* is the friction’s force.

(b)

Since the block is at rest, the net horizontal and vertical forces that act on the block must be zero each.

Equate the net vertical forces to zero. Take the forces along the upward direction to be positive.

Step 3

Substitute 300 N for *T* and 80 ...

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