20. a skater of mass 60 kg has an initial velocity of 12 m/s.
he slides on ice where the frictional force is 36 n. how
far will the skater slide before he stops?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

In science and physics what is the standard unit of measure for speed?

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