A ballon is rising with a velocity of 9.8 m/s and a bag is dropped from it when it is at a height of 39.2 m. Calculate the time taken by the bag to reach the ground.

Explanation

Taking vector quantities in the upward direction as negative and downward as positive Now
u = -9.8 m / s g =9.8 m/s^2, S = 39.2 m
`S = ut+1/2 g t^2, 39.2 = -9.8t+1/2t^2, or t^2-2t-8=0 or t=4s`