InterviewSolution
Saved Bookmarks
| 1. |
A balloon is ascending at the rate of `9.8 m//s` and is 39.2 m above the ground when a package is dropped. (a) How long does the package take to reach the ground? (b) with what speed does it hit the ground ? `(g = 9.8 m//s^(2))` |
|
Answer» Correct Answer - (a) 4 s (b) 29.4 m/s Taking downward direction `+ve , u = - 9.8 m//s, s = 39.2 m " and " a = g = +9.8 m//s^(2)` (a) `39.2 = - 9.8 t + (1)/(2) (9.8) t^(2)` `4.9 t^(2) - 9.8 t - 39.2 = 0` `t^(2) - 2t - 8 = 0` `(t - 4) (t + 2) = 0` `t = 4s` (b) `v = u + g t = - 9.8 xx 4 = 29.4 m//s` |
|