Question

Two balls A and B are projected vertically upwards with different velocities. What is the relative acceleration between them?

• A. g
  
• B. 2g
• C. 0
• D. None of the above
  

Answer 1

Answer: (C)

0

Acceleration of ball A $\overrightarrow{a_A}=-g\hat{j}$

Acceleration of ball B $\overrightarrow{a_B}=-g\hat{j}$

$\therefore$ Relative acceleration of A w.r.t B $\overrightarrow{a_{AB}}=\overrightarrow{a_A}-\overrightarrow{a_B}$

$⟹$ $\overrightarrow{a_{AB}}=-g\hat{j}-(-g\hat{j})=0$