Over a 60 second period, an object’s velocity changes from -10m/s to -30m/s. What was its acceleration over the time period?

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

What do you think car designers do if the damage caused by a crash test is too severe?