kinetic energy of moving car if velocity is reduced to 1\3 rd of the initial velocity
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Answer:
Given: Initial velocity =v; Final velocity =
3
v
Initial kinetic energy k
1
=
2
1
×m×v
2
Final kinetic energy k
2
=
2
1
×m×(
3
v
)
2
=
9
1
×
2
1
mv
2
Change in kinetic energy =
2
1
mv
2
−
9
1
×
2
1
mv
2
=
2
1
mv
2
(1−
9
1
)
=
9
8
×
2
1
×mv
2
=
9
8
× Initial kinetic energy.
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