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A heavy particle is projected from a point on the horizontal at an angle `45^(@)` wil the horizontal with a speed of 20 m/s. Then the radius of the curvature of its path at the instant of crossing the same horizontal is ______A. `10 sqrt(2)`B. `40 sqrt(2)`C. `20 sqrt(2)`D. none of these |
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Answer» Correct Answer - B Radial acceleration at the point of landing `a_(n) = g cos 45 = (u^(2))/(r)` `rArr r =(u^(2))/(g cos45)=((20)^(2))/(10xx1//sqrt(2))=40 sqrt(2)` |
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