Laws Of Motion Question 344
Question: A bridge is in the form of a semi-circle of radius 40m. The greatest speed with which a motor cycle can cross the bridge without leaving the ground at the highest point is $ ( g=10m{{s}^{-2}} ) $ (frictional force is negligibly small)
Options:
A) $ 40m{{s}^{-1}} $
B) $ 20m{{s}^{-1}} $
C) $ 30m{{s}^{-1}} $
D) $ \text{15 }m{{s}^{-1}} $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ v=\sqrt{gr}=\sqrt{10\times 40}=20m{{s}^{-1}} $
