A 4-m-long ladder (mass $= 56 \mathrm {~kg}$ ) leans against a frictionless wall. The base of the ladder makes an angle $\theta$ with the rough floor $\left( \mu _ { s } \right)$. If $\mu _ { s } = 0.5$, the minimum value of $\theta$, such that the ladder will not slip, is
A) 45º.
B) 56º.
C) 61º.
D) 72º.

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The Answer of A 4-m-long ladder (mass $= 56 \mathrm {~kg}$ ) leans against a frictionless wall. The base of the ladder makes an angle $\theta$ with the rough floor $\left( \mu _ { s } \right)$. If $\mu _ { s } = 0.5$, the minimum value of $\theta$, such that the ladder will not slip, is
A) 45º.
B) 56º.
C) 61º.
D) 72º.

A 4-M-Long Ladder (Mass =56 kg= 56 \mathrm {~kg}=56 kg ) Leans Against a Frictionless Wall

A 4-M-Long Ladder (Mass $= 56 \mathrm {~kg}$ ) Leans Against a Frictionless Wall