A3.2-kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. the elastic potential energy of this spring-block system is 1.8 j. what is the elastic potential energy of the system when the 3.2-kg block is replaced by a 5.0-kg block?

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?

How many electrons does each element require in its valence shell to become stable?