George walks to a friends house. he walks 750 meters north, then realizes he walked too far. he turns around and walks 250 meters south. the entire walk takes him 13 seconds. what is his speed per second?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass