Q. Which of the following statements is wrong?
A) KE of a body is independent of the direction of motion
B) In an elastic collision of two bodies ,the momentum and energy of each body is conserved
C) If two protons are brought towards each other the PE of the system decreases.
D) A body cannot have energy without momentum.
Explanation
(c) If momentum is Zero ie, if p=0,then kinetic energy
$K = \frac{p^{2}}{2m} = 0$
But potential energy cannot be zero, thus a body can have energy without momentum.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.