I need help ASAP!! To score in the 85th percentile at age 15 in the President's Challenge, girls must . A. complete the shuttle run in 9.0 seconds B. run a mile in 8:08 C. complete 11 pull-ups D. perform 57 curl-ups in 60 seconds

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)