Nicki rides her bike at a constant speed for 6 km. that part of her ride takes her 1 h. she then rides her bike at a constant speed for another 9 km. that part of her trip takes her 2 h. what is her average speed?

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.