Question

Which of the following are equations of motion for an object moving with a uniform velocity?

• A. $a=0,v=u$
• B. $s=ut$
• C. $v^2-u^2=0$
• D. All the above

Answer 1

Answer: (D)

All the above

In uniform motion, the acceleration is zero. So, the 1st equation of motion v=u+at becomes v=u as a=0.
The 2nd equation of motion $s=ut+\frac{1}{2}a{t}^2$ becomes s=ut as a=0.
The 3rd equation of motion $v^2-u^2=2as$ becomes $v^2-u^2=0$.
Hence, the equation of motion in this case are v=u, s=ut and $v^2-u^2=0$.