A man in a balloon rising vertically with an acceleration of \[4.9\,m/{{\sec }^{2}}\] releases a ball 2 sec after the balloon is let go from the ground. The greatest height above the ground reached by the ball is \[(g=9.8\,m/{{\sec }^{2}})\] [MNR 1986]

• A.             14.7 m
• B.             19.6 m
• C.             9.8 m  
• D.             24.5 m