Ablock falls from a ledge 10 m high. just before it hits the ground, its kinetic energy
a. equal to its potential energy at that point.
b. equal to zero.
c. increasing.
d. equal to its potential energy on the ledge.
e. all converted into thermal energy.
f. the same as on the ledge.

**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