Question
a balloon is moving up from ground in such a way that its acceleration is linearly decreasing with its height from above the ground. it start from the ground with acceleration 4m/s_2 and with zero initial velocity. its acceleration becomes zero at height 3m. the speed of balloon at a height 1.5 m is
1.4m/s 2.8m/s 3.6m/s 4.3m/s