a ball is dropped from elevator moving upward with an accleration ‘a’ by a boy standing in it . the acceleration of ball with respect to elevator

Divya asks: a ball is dropped from elevator moving upward with an accleration ‘a’ by a boy standing in it . the acceleration of ball with respect to elevator is? (take upward direction positive)

Sign Convention in kinematics

Please tell me the sign convension for   velocity & accleration for a body  moving upwards ,downwards, right   and left relative to another body? (Apoorv Katoch asked) Answer: In motion, sign conventions are arbitrary. You take one direction as positive and the direction opposite to it as negative. For example, if you consider a [...]