Question

3. A balloon is at a height of 81 m and is ascending upwards with a velocity of 12 m/s. A body of 2 kg weight is dropped from it. If g= 10 m/s2, the body will reach the surface of the earth in​

Answer 1

Using the equation : h=ut+21gt2

⇒81=−12t+21×10×t2⇒t=5.4sec