In which task is a camera the most useful? to measure the length of the leaves of a plant
to predict the star count over a broad area
to measure the thickness of different coins
to predict the number of people that live in a community

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