An object has traveled 1500 meters in 18 seconds what is its average speed?

Carbon 14 is a naturally occurring stable

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.