Which of the following most likely causes the car to come to a stop?
1. kinetic energy to thermal energy
2. electrical energy to potential energy
3. potential energy to kinetic energy
4. mechanical energy to chemical energy

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)

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class