Kinematics Question 533
Question: A sphere it’s suspended by a thread of length $ l $ . What minimum horizontal velocity has to be imparted the ball for it to reach the height of the suspension[ it’sM Dhanbad 1994]
Options:
A) $ gl $
B)$ 2gl $
C) $ \sqrt{gl} $
D) $ \sqrt{2gl} $
Show Answer
Answer:
Correct Answer: D
Solution:
Kinetic energy given to a sphere at lowest point = potential energy at the height of suspension therefore $ \frac{1}{2}mv^{2}=mgl $ $ v=\sqrt{2gl} $
