Question

When a body is accelerated:
(𝑖) its velocity always changes,
(𝑖𝑖) its speed always changes,
(𝑖𝑖𝑖) its direction always changes and
(𝑖𝑣) its speed may or may not change.
Which of the followings is correct?

• A. $\left(i\right)and\left(iv\right)$
• B. $\left(i\right)and\left(ii\right)$
• C. $\left(ii\right)and\left(ii\right)$
• D. $\left(i\right)$ Only

Answer 1

The correct option is A $\left(i\right)and\left(iv\right)$

Acceleration means change in velocity. So, if there is acceleration, velocity will change definitely.

Under acceleration, speed may not change if direction changes (like uniform circular motion), and direction may not change if speed changes (motion in straight line).

Final answer: ($b$)