What is the velocity of a 0.8kg ball that has a momentum of 3 kg*m/s?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Which object is most likely represented by a dot?

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)