Which of the following statements about acceleration is correct________
A. Acceleration is caused by changes in velocity.
B. The acceleration is always zero, and the motion state must not change.
C. When the direction of acceleration changes, the direction of velocity must change.
D. The acceleration is a positive value, the speed must be increasing.
Answer:B
Which of the following statements about acceleration is correct________
A. Acceleration is caused by changes in velocity. B. The acceleration is always zero, and the motion state must not change. C. When the direction of acceleration changes, the direction of velocity must change. D. The acceleration is a positive value, the speed must be increasing.