Homework Help: Physics

Posted by Vladimyr on Tuesday, May 29, 2012 at 9:18pm.

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,

Physics - Elena, Wednesday, May 30, 2012 at 7:36am
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

Answer this Question

Related Questions

Physics - Two cars are moving. The first car has twice the mass of the second ...
Physics - Please Help - Two cars are moving. The first car has twice the mass of...
Physics - Please Help - Two cars are moving. The first car has twice the mass of...
Physics - Two cars are moving. The first car has twice the mass of the second ...
Physics - Two cars are moving. The first car has twice the mass of the second ...
physics - 2 cars are in a race the first car is 200m ahead of the second car.the...
physics - 7. Two cars are moving. The first car has twice the mass of the second...
Physics - One car has twice the maqss of a second car, but only half as much ...
Univ-Phys - One car has twice the mass of a second car, but only half as much ...
Physics (algebra bit) - I do not see how to do this problem One car has twice ...

For Further Reading

First Name:
School Subject:
Answer: