A wildebeest is running in a straight line, which we shall call the x axis, with the positive direction to the right. A figure shows this animal's velocity as a function of time.

Which of the following statements about the animal's motion must be true?

A. Its acceleration is increasing.
B. Its speed is decreasing from a to b and increasing from b to c.
C. It is moving to the right between a and c.
D. It is moving to the left between a and b and to the right between b and c.

The answer is B and D but please explain.

Question

A wildebeest is running in a straight line, which we shall call the x axis, with the positive direction to the right. A figure shows this animal's velocity as a function of time.

Which of the following statements about the animal's motion must be true?

A. Its acceleration is increasing.
B. Its speed is decreasing from a to b and increasing from b to c.
C. It is moving to the right between a and c.
D. It is moving to the left between a and b and to the right between b and c.

The answer is B and D but please explain.

parthkohli · Answer

Can you please post the figure?  I may help you here!

anonymous · Answer

|dw:1391491977614:dw|

anonymous · Answer

on (a,b), going left and slowing down
on (a,b), going right and speeding up

anonymous · Answer

when v(t) > 0, it goes right
when v(t) < 0, it goes left.