Why can acceleration include only a change in direction? a. a change in direction always involves a change in speed. b. velocity describes both speed and direction. c. the scientific definition of acceleration does not include speed. d. objects always rotate at a constant velocity. it is science

First we shall look at some terms:

Velocity - frequency of change of an objects position.

Acceleration - frequency of change of an objects velocity

Since velocity covers both change in direction and speed, we can asume that the answer is B, not because it's the only one we worked with, but because the others don't make any sense:

A - this is not correct, because a chnage in direction can be done withough a change in speed.

C - The scientific definition of acceleration does include speed, and this is not a reasonable answer.

D - Velocity can change, unlike said in the sentence.

Hope it helped,

BioTeacher101

your answer is c! hope this : )