1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stells [14]
3 years ago
10

A ranger in a national park is driving at 52 km/h when a deer jumps onto the road 87 m ahead of the vehicle. After a reaction ti

me of t s, the ranger applies the brakes to produce a deceleration of 4.0 m/s2 . What is the maximum reaction time allowed if the ranger is to avoid hitting the deer? Answer in units of s.
Physics
1 answer:
lys-0071 [83]3 years ago
4 0

Answer:

Time, t = 0.23 seconds

Explanation:

It is given that,

Initial speed of the ranger, u = 52 km/h = 14.44 m/s

Final speed of the ranger, v = 0 (as brakes are applied)

Acceleration of the ranger, a=-4\ m/s^2

Distance between deer and the vehicle, d = 87 m

Let d' is the distance covered by the deer so that it comes top rest. So,

d'=\dfrac{v^2-u^2}{2a}

d'=\dfrac{-(14.44)^2}{2\times -4}

d' = 26.06 m

Distance between the point where the deer stops and the vehicle is :

D=d-d'

D=87 - 26.06 = 60.94 m

Let t is the maximum reaction time allowed if the ranger is to avoid hitting the deer. It can be calculated as :

t=\dfrac{v}{D}

t=\dfrac{14.44}{60.94}

t = 0.23 seconds

Hence, this is the required solution.

You might be interested in
What is the function of the bronchioles?<br> please help
beks73 [17]

Answer:

The bronchioles function is to deliver air to tiny sacs called alveoli where oxygen and carbon dioxide are exchanged.

Explanation:

Bronchioles are air passages inside the lungs that branch off like tree limbs from the bronchi—the two main air passages into which air flows from the trachea (windpipe) after being inhaled through the nose or mouth. The bronchioles deliver air to tiny sacs called alveoli where oxygen and carbon dioxide are exchanged.

4 0
2 years ago
How long would it take to go 11 miles at 22 mph?
harkovskaia [24]
It would tack about 3.2 h

5 0
3 years ago
Where do people get their energy to turn a wheel??
Vesna [10]

Answer:

from food eaten (i.e contain carnlbohyadrates)

5 0
2 years ago
How many type of expansion physic
Yuki888 [10]

Answer:

Three types of thermal expansion are linear expansion,s superficial expansion,cubical expansion

4 0
3 years ago
True or False? Materials that are good conductors of heat are usually poor conductors of electricity.
alexandr402 [8]

False

HOPE THIS WILL HELP YOU

5 0
3 years ago
Read 2 more answers
Other questions:
  • Scientific word of volume
    14·2 answers
  • To say that electric charge is conserved means that no case has ever been found where
    8·1 answer
  • Match the story events on the left to the correct element of plot structure on the right
    5·2 answers
  • Which statement best describes how a wave would move differently through a pot of boiling water than the steam created from it?
    12·2 answers
  • A squirrel drops an acorn onto the head of an unsuspecting dog. The acorn falls 4.0\,\text m4.0m4, point, 0, start text, m, end
    12·1 answer
  • A car of mass 750 kg has an initial speed of 75 mph. Traveling in a straight line, its speed is increased uniformly to 120 mph i
    5·1 answer
  • A tractor pulls a 978 kg wagon at a velocity of 4.9 m/s. How many watts of power are exerted by the tractor motor is the tractor
    10·1 answer
  • 4. Density is a property of all matter.
    7·1 answer
  • What is food called when it enters the pharynx?<br><br> A.Bile <br> B.bolus<br> C. Food<br> D. Feces
    5·1 answer
  • Runs 4 m North and then runs 9 m West. Calculate Distance and Displacement.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!