3. A battery has an e. m.f. of 3 V and an internal resistance of 12. What current will it give if it is connected to a circuit of
resistance:
a) 2.12
b) 4.1?
What current will it give if its terminals are short-circuited?

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.