Movers are pushing a 150 kg crate 12.3 m across a rough floor at a constant velocity. How much work do movers do if the coefficient of kinetic friction between the crate and the floor is 0.70? How long does it take them if they use 400 W of power?

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.