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A ladder AB of length 5 m and weight (W) 600 N is resting against a wall. Assuming frictionless contact at the floor (B) and the wall (A), the magnitude of the force P (in newton) required to maintain equilibrium of the ladder is_____.
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- 100 N
- 400 N
- 40 N
- 4 N
Correct Option: B
Taking moments about B
∑MB = 0
⇒ W × 2 = RA × 3
| ⇒ RA = | = 400 | |
| 3 |
∑H = 0
⇒ RA = P = 400 N
