An object moving forward at 10 m/s suddenly begins moving backward at 5 m/s. what is the most accurate explanation for this change?

the object was traveling in a straight line until it hit a brick wall and bounced backward.

the force pushing back on the object became greater than the force pushing the object forward.

the forces acting on the object were equal at first. then the forces became unequal, causing the object to change its direction.

the forces were balanced in the forward direction. then they became balanced in the backward direction.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.