menu
Qammunity
Login
Register
My account
Edit my Profile
Private messages
My favorites
Ask a Question
Questions
Unanswered
Tags
Categories
Ask a Question
A motorist is traveling at 20 m/s. He is 60 m from a stoplight when he sees it turn yellow. Is reaction time, before stepping on the brake, is 0.50 s. What steady acceleration (slowing down) while braking
asked
Jan 25, 2019
44.1k
views
1
vote
A motorist is traveling at 20 m/s. He is 60 m from a stoplight when he sees it turn yellow. Is reaction time, before stepping on the brake, is 0.50 s. What steady acceleration (slowing down) while braking will bring him to a stop right at the light?
Physics
college
Arnold Rimmer
asked
by
Arnold Rimmer
8.9k
points
answer
comment
share this
share
0 Comments
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
1
vote
V₀ = V₁ + 2ax
V₀ = final velocity which is 0 m/s
V₁ = initial velocity which is 20 m/s
x = distance which is 60-(0.5 x 20) =50m
this is because his reaction time is 0.5 sec so he traveled 10m before stepping on the break paddle.
a= (V₀-V₁) / 2x
= (0-20) / 2*50
= -0.2m/s
the negative is because it is a deceleration speed hence it is 0.2m/s
Danae
answered
Jan 31, 2019
by
Danae
7.5k
points
ask related question
comment
share this
0 Comments
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Nov 19, 2020
210k
views
A motorist sees the traffic light turns yellow when he is at 50 m from the intersection. If his speed at the moment of seeing traffic light is 90 mi/h, and His reaction time, before stepping on the brake
Patwie
asked
Nov 19, 2020
by
Patwie
8.1k
points
Physics
college
1
answer
4
votes
210k
views
asked
Oct 7, 2021
78.3k
views
A motorist is traveling at 25m/s. He is 100 m from a stop light when he sees it turns yellow. His reaction time, before stepping on the brake is 0.50 ses a. What is the distance traveled during the reaction
Muhammad Sadiq Alvi
asked
Oct 7, 2021
by
Muhammad Sadiq Alvi
9.2k
points
Physics
college
1
answer
2
votes
78.3k
views
asked
Feb 5, 2018
105k
views
Which situation shows potential energy being transformed into kinetic energy? A car stopped at a stoplight A flowerpot falling from a balcony A cow standing in a field A bicycle slowing down
Abhishek Patidar
asked
Feb 5, 2018
by
Abhishek Patidar
8.8k
points
Biology
middle-school
2
answers
1
vote
105k
views
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.
9.4m
questions
12.2m
answers
Other Questions
A snowball is launched horizontally from the top of a building at v = 16.9 m/s. If it lands d = 44 meters from the bottom, how high (in m) was the building?
What type of rock is the Haystack rock (igneous, Metamorphic, or Sedimentary)
what is a device that transforms thermal energy to mechanical energy
How many light sources do you know Pls list them
What is the minimum resistance which can be made using five resistors each of 1/5
Twitter
WhatsApp
Facebook
Reddit
LinkedIn
Email
Link Copied!
Copy
Search Qammunity