Kinematics Question 421
Question: From a building two balls A and B are thrown such that a is thrown upwards and B downwards (both vertically). If $ v _{A} $ and $ v _{B} $ are their respective velocities on reaching the ground, then
Options:
A) $ v _{B}>v _{A} $
B) $ v _{A}=v _{B} $
C) $ v _{A}>v _{B} $
D) their velocities depend on their masses.
Show Answer
Answer:
Correct Answer: B
Solution:
Ball a is thrown upwards from the building.
During it’s downward journey when it comes back to the point of throw, it’s speed is equal to the speed of throw. So, for the journey of both the balls from point4to5.
We can apply $ {{v}^{2}}-{{u}^{2}}\text{=2gh}\text{.} $ As u, g, h are same for both the balls, $ {v _{A}}\text{=}{v _{B}} $
