Question

An object’s position in meters and motion in meters per second can be described by x = −12 − 5t + 3t^2 during the time interval 0$\leq$t$\leq$1.

Which of the following statements is the best description of the object’s motion?

A
The acceleration of the object is zero.

B
The initial position of the object is −12 meters.

C
The object’s speed is increasing.

D
The average velocity of the object is −5 m/s.

Answer 1

Answer:

B

Step-by-step explanation:

Comment

Thank you for editing the choices.

The reason the answer is B is because the object begins to move when t = 0. Only - 12 will be left after that.

The acceleration is 3. I don't know how to explain that because I'm using calculus and I don't know if you have taken that or not. I assume not by the right answer you are not in a calculus class. You'll have to ask your instructor about the actual answer. Not A

The same is true of D. The answer is - 5 m/s. It is - 4  Not D

All the minus signs indicate a decrease during that interval. Not C