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7. Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both ca...Asked by Vladimyr
Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are, respectively,
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Answered by
Elena
m1 =2•m2,
KE1 =KE2/2.
m1•v1²/2 =m2•v2²/2 = m1•v2²/4.
v1=v2/2.
m1• (v1+8)²/2 = m2• (v2+8)²/2 =
=m1• (v2+8)²/4,
v1 =sqrt(32)= 5.66 m/s.
v2 =11.3 m/s
KE1 =KE2/2.
m1•v1²/2 =m2•v2²/2 = m1•v2²/4.
v1=v2/2.
m1• (v1+8)²/2 = m2• (v2+8)²/2 =
=m1• (v2+8)²/4,
v1 =sqrt(32)= 5.66 m/s.
v2 =11.3 m/s
Answered by
Breyonna Fawling
What if the instead of 8.00m/s it was 6.52m/s?
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