When we look at these objects in the night sky, which are we seeing as they were farthest back in time? The Pleiades (~440 light years distant)

Castor (~50 light years distant)

The Orion Nebula (~1340 light years distant)

Sirius (~9 light years distant)

A6.0-kilogram cart initially traveling at 4.0 meters per second east accelerates uniformly at 0.50 meter per second squared east for 3.0 seconds. what is the speed of the cart at the end of this 3.0 second interval? (1) 1.5 m/s (3) 3.0 m/s (2) 5.5 m/s (4) 7.0 m/s