Question

A balloon is ascending at the rate of 9.8 ms^-1 at a height of 39.2 m above the ground when a food packet is dropped from the balloon. the velocity with which the food packet reach the ground is​

Answer 1

Answer:

Answer: (a) 4 s (b) 29.4 m/s

Explanation:

Taking downward direction +ve,u=−9.8m/s,s=39.2m and a=g=+9.8m/s2

(a) 39.2=−9.8t+12(9.8)t2

4.9t2−9.8t−39.2=0

t2−2t−8=0

(t−4)(t+2)=0

t=4s