Although the planets in our solar system have unique features, they also have similarities. which of the following characteristics is most similar among the planets in our solar system?
a) mass
b) shape of orbit
c) number of satellites
d) chemical composition

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)