First, we need to convert the units of the given velocity to m/sec
144 km/hr = (144 km / hr) x (1000 m / 1 km) x (1 hr / 3600 s) = 40 m/s
Now, to solve this question, we can use one of the equations of motion:
a = (Vf - Vi) / t where:
a is the acceleration we are looking for
Vf is the final velocity of the car = 0 m/sec
Vi is the initial velocity of the car = 40 m/sec
t is the time taken = 12 seconds
Substitute with these givens in the above equation to get the acceleration as follows:
a = (0-40)/12 = -3.334 m/s^2
There are a number of ways you can change the volume of a gas.
Temperature: if you heat the gas it rises causing a change volume because the electrons gain more thermal energy BUT if you cool the gas down it sinks decreasing the molecules (the opposite effect)
Pressure can also change a gases volume. high pressure forces the molecules together creating a solid (along with cold temperatures)
Hope this helps!
Pick C. 5.0m/s it’s the right one
