If someone troubles 55 km in 3.0 hoursthen how far can you go in 24 hours

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples