A little help please?
Spotting a police car, you brake your Porsche from a speed of 100 km/h
to a speed of 80.0 km/h during a displacement of 88.0 m, at a constant acceleration.
a. What is that acceleration?
b. How much time is required for the given decrease in speed?
Spotting a police car, you brake your Porsche from a speed of 100 km/h
to a speed of 80.0 km/h during a displacement of 88.0 m, at a constant acceleration.
a. What is that acceleration?
b. How much time is required for the given decrease in speed?
1 Answer
a.
b.
Explanation:
We have velocity in km/hr and displacement in m. Since we have to make a unit conversion, might as well do it so it will yield the answer in the normal (SI) units for acceleration.
a. Using the formula of motion
#(22.22 m/s)^2 = (27.78 m/s)^2 + 2a88.0 m
b. Since the acceleration was constant, we can use the average velocity, and the distance to determine the time.
As a double-check, if we convert
I hope this helps,
Steve