Question

10. Block \( A \) is moving away from the wall at a speed \( v \) and acceleration \( a \). (1) Velocity of \( B \) is \( v \) with respect to \( A \). (2) Acceleration of \( B \) is a with respect to \( A \). (3) Acceleration of \( B \) is \( 4 a \) with respect to \( A \). (4) Acceleration of \( B \) is \( \sqrt{17} a \) with respect to \( A \).