How do objects move under the influence of gravity?

Which instrument is used to measure air temperature

What equation is used to calculate the weight of an object on a plant ?

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)