Question

How is the kinetic energy of a moving car affected if mass is tribled? Its velocity is one_ fourth

Answer 1

Initial KE =
$\frac{1}{2} m {v}^{2}$
Now,
Mass=3m
Velocity=1/4v

KE=
$\frac{1}{2} \times 3m \times ({ \frac{v}{4} })^{2}$
KE=3/32 mv^2

KE(f)=x KE(i)
x= 3/16

Therefore KE becomes 3/16 times the initial.

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