Question

If the units of length and time are doubled, then the unit of speed :

• A. doubles
• B. gets halved
• C. becomes one - third
• D. remains constant

Answer 1

Answer: (D)

remains constant

Velocity $v=\frac{distance\left(d\right)}{time\left(t\right)}$

If, length and time are doubled, the velocity becomes,

$v^{\prime }=\frac{2d}{2t}$

$=\frac{d}{t}=v$

Thus, the velocity is same as before.