A skater is moving on ice at a velocity of 15m/s in a circle of radius 22.5m. What is the angle the person makes with the ground?
A
30∘
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B
45∘
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C
0∘
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D
60∘
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Solution
The correct option is B45∘ Let the skater bend w.r.t vertical plane by an angle θ. Then for safe skating, he should follow the condition of v2rg=tanθ ⇒tanθ=v2rg ⇒tanθ=15222.5×10=1 ⇒θ=45∘ (This angle is with the vertical) ∴ Angle made with the ground =90∘−45∘=45∘