Question 1 2 pts A car is moving in the negative x-direction and is slowing down

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Question 1 2 pts A car is moving in the negative x-direction and is slowing down. Its x-components of velocity and acceleration are both positive both negative velocity positive, acceleration negative velocity negative, acceleration positive | Question 2 3 pts You are given the vtgraph (r-component of velocity vs time graph) for an object moving along the x-axis with constant acceleration. Which of the following could you not determine from the information given in this graph alone? O The object's acceleration at any time t The object's initial velocity The object's initial position You can determine all of these quantities

Explanation / Answer

Answer:

(a) A car is moving in the negative x-direction and is slowing down. Its x-component of velocity and acceleration are,

the answer is velocity is negative and acceleration is positive. (option d )

Because, in negative x-direction the velocity has negative value, and the car is slowing down, that means deceleration or negative acceleration, therefore, the x-component of negative acceleration in negative x-direction is positive acceleration.

(b) Acceleration is constant, so we can easily determine the acceleration value from the graph and also we can determine the initial velocity value easily (i.e., at t = 0, the velocity value is nothing but initial velocity). But, it is hard to find out the object's initial positive from the information given in graph alone, we need additional information.

Hence, the correct answer is option (C)

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