Calculate the kinetic energy of a $2$ kg body moving at $3$ m s$^{-1}$.
A$18$ J
B$6$ J
C$9$ JCORRECT
D$3$ J
JUPEBPhysicsWork, Energy and Power
AI
Toaster Teacher
Why the answer is C, and why the others tempt you.
$KE = \dfrac{1}{2}mv^2 = \dfrac{1}{2} \times 2 \times 9 = 9$ J. Forgetting the half gives 18 J, and forgetting to square the velocity gives 3 J.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →
Practice more Physics questions
JUPEB Physics has thousands more questions like this — with Worked answers on every one.