Answer
(a) object of mass $4m$ and speed $v$.
Work Step by Step
Kinetic energy for a body with mass $m$ and speed $v$ is given by $\frac{1}{2}mv^2$.
The object in option (a) of mass $4m$ and speed $v$ has the least kinetic energy of $2mv^2$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.