Respuesta :
Answer: 2 mph per second
Work Shown:
acceleration = (change in speed)/(change in time)
acceleration = (finalSpeed - initialSpeed)/(change in time)
acceleration = (7 mph - 3 mph)/(2 seconds)
acceleration = (4 mph)/(2 seconds)
acceleration = 2 mph per second
This means that for each second, Lisa increased her speed by 2 mph.
Lisa's change in speed is 4 miles per hour.
Lisa's acceleration is 2 miles per hour.
Given that,
Lisa is skateboarding at a speed of three miles per hour.
A dog starts to chase her, and she speeds up to seven miles per hour.
When Lisa increased her speed in letter c, the increase took two seconds.
We have to determine,
What was her acceleration?
What is her change in speed in miles per hour?
According to the question,
The speed of Lisa is = 3 miles per hour
A dog starts to chase her, and she speeds up to seven miles per hour.
The change in speed after dog chase her is,
= 7 miles per hour - 3 miles per hour
= 4 miles per hour
Lisa's change in speed is 4 miles per hour.
When Lisa increased her speed in letter c, the increase took two seconds.
Then,
The Lisa acceleration is,
[tex]\rm Acceleration = \dfrac{Change \ in \ speed }{Change \ in \ time }\\\\Acceleration = \dfrac{4}{2}\\\\Acceleration = 2 \ miles \ per \ hour[/tex]
Hence, Lisa's acceleration is 2 miles per hour.
For more details refer to the link given below.
https://brainly.com/question/20696932
