1. A stone is dropped off a bridge 52.3 m high. At what speed will the stone hit the water?

Can someone explain to me how to do this problem ?

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.