An open lift is moving upward with velocity $10 m/s$. It has an upward acceleration of $2 m/s^2$ . A ball is projected upward with velocity $20 m/s$ relative to ground. What is displacement of lift and ball at a time when ball meets the lift.

Question

 

$$(a)\;19.4\; m \quad (b)\;9.8 m \quad (c)\;16.2 m \quad (d)\;18.6$$