HEL!! SHOW WPORK Atmospheric pressure is announced during weather reports in the US in units of inches of mercury. How many inches of mercury would exert a pressure of 1.0 atm.? In Canada, atmospheric pressure is reported in units of kilopascals, What is 1.0 atm. In kilopascals?

what is the question?

(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

a chemical change results in a new substance being formed; whereas a physical change will result in a different state of matter

explanation: