Answer:
the driveway takes about 243 meters per second for cfar to accelerate
Explanation:
That first one you have selected (3,-3) works in both equations so it's correct.
good job.
you can do this guess and test method with multiple choice answers. If it works in both equations it is the solution. Otherwise use substitution or elimination to combine the two into one equation in only one variable. Then you can solve for the one variable first and use it to solve for the other.
If its not Distance traveled then its energy
Answer:
Same momentum but speed is reduced 4 times.
Explanation:
According to the law of momentum conservation, the total momentum of the system before and after the collision is the same
Before the collision, the bigger car is at rest, only the 1st car of mass m is moving at speed v
p = mv
After the collision, both cars are connected and moving at speed V
P = (m + 3m)V = 4mV
These 2 momentum are equal
p = P
mv = 4mV
V = v/4
So after the collision, they have the same momentum but the speed decreased 4 times