1. After examining the DNA fingerprint of the victim and then the seven suspects, which

suspect committed the crime? How did you determine this?

Any suspect whose DNA fingerprint matches with that of the victim committed the crime.

Explanation:

Taking a cold blood murder perpetrated by a suspect with a knife as an example. To know the real murderer among 7 suspects, A DNA fingerprint is conducted on the knife used and whoever matches with the DNA fingerprint on the knife committed the crime.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied