Question

If a body travels at a uniform velocity of $u$ for $t$ seconds and at a different velocity of $v$ for the next $t$ seconds, what is the total distance covered in $2t$ seconds?

• A. The average velocity of a moving body can be zero.
• B. The average velocity of a moving body cannot be zero.
• C. The average speed of a moving body can be zero.
• D. The average speed of a moving body is always zero.

Answer 1

The correct option is D

The average speed of a moving body is always zero.

Given,

Velocity for first $ts$ = $u$

Velocity for next $ts$ = $v$

Distance covered in first $t$ seconds = $ut$
Distance covered in the next $t$ seconds = $vt$
Total distance covered = $ut+vt=(u+v)\times t$