Little ? ? no sé como resolver los ejercicios.

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.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?