Question

Two bodies collide as shown in the diagram. During the collision, they exert impulse of magnitude $J$ on each other.



For what values of $J$ (in $Ns$ ) the $2kg$ block will change its direction of velocity?

• A. $J<12$
• B. $J>12$
• C. $J<10$
• D. $J>10$

Answer 1

Answer: (B)

$2kg$ block will change its direction if $v_2$ is negative.
or $6-\frac{J}{2}<0$
$\therefore \frac{J}{2}>6$
or $J>12\text{N s}$