A jogger runs at an average speed of 4.20 mi/h. (a) how fast is she running in m/s? (report your answer to the correct number of
1 answer:
You might be interested in
Answer:
Explanation:
Hi there,
To get started, recall the kinematic equations from either a textbook, equation sheet, etc. Kinematic equations are used when acceleration is <em>constant,</em> as stated in the prompt.
Best way to use kinematic equations is to see which variable you are looking for, then which variable is unknown to you and is not needed for that equation.
a) average velocity
Takes the form of:
this is the literal definition of average velocity; initial plus final divided by 2.
We know total displacement and total time elapsed, so we will use the middle form of the equation:
b) the final velocity
We can still use the average velocity formula, as the other two equations that include final velocity have acceleration variable which is unknown as of now.
Solve for final velocity:
this makes sense, since a velocity later in time is higher than a velocity earlier in time. It is increasing with increasing time because of acceleration.
c) the acceleration
There are two equations that can be used to solve this, but we will use the less time-consuming one, but both produce same answer:
Notice, change in velocity over change in time, and acceleration is constant. When acceleration is constant, it models a linear function, and acc. is just slope!
Study well and persevere. If you liked this solution, hit Thanks or give a rating!
thanks,