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Physics
Which of the following statements is wrong ?
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Q. Which of the following statements is wrong ?
UPSEE
UPSEE 2009
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 can not have energy without momentum
Solution:
If momentum is zero ie, if $p=0$,
then kinetic energy $K=p^{2} / 2 \,m=0$
But potential energy can not be zero thus a body can have energy without momentum.