a car slows down uniformly from a speed of 21.0 m/s to rest in 6.00 s. how far did it travel in that time?

The keyword slows down “uniformly” means that the car had a constant deceleration. Therefore we can use the formulas for linear motion.

a = (vf – vi) / t                    ---> 1

s = vi t + 0.5 a t^2              ---> 2

where a is acceleration, v is velocity with notation f and i for final and initial, s is the distance travelled, and t stands for time

First we solve for acceleration using equation 1:

a = (0 – 21) / 6

a = - 3.5 m / s^2                                (negative means deceleration)

Then we can now calculate for the value of s using equation 2:

s = 21 (6) + 0.5 (-3.5) (6)^2

s = 63 m

Therefore the car travelled 63 m before it came to a stop.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

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