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
Arturiano [62]
3 years ago
5

A sailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5​​​​m​​/s2 for 4s. After t

he wind stops, the sailboat is traveling to the left with a velocity of 3.0​m/s.
Assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind?
Answer using a coordinate system where rightward is positive.
Physics
2 answers:
Rus_ich [418]3 years ago
4 0

Explanation :

Let rightward direction is considered as positive and leftward direction is considered as negative.

Given that,

Acceleration of the boat, a=-2.5\ m/s^2 ( in left )

Time taken, t=4\ s

Final velocity of the boat, v=-3\ m/s

We have to find initial velocity (u) of the sailboat.

Using first equation of motion :

v=u+at

u=v-at

u=-3-(-2.5)\times 4

u=-13\ m/s

So, initially the boat is moving with a speed of 13 m/s in leftwards direction.

Hence, this is the required solution.

Pavlova-9 [17]3 years ago
3 0
Taking right movement to be positive means leftward movement is negative.
Hence we have a deceleration of
a = - 2.5 {ms}^{ - 2}

t = 4s
v = 3.0 {ms}^{ - 1}
Using this 'suvat' equation
v = u + at
we can determine the initial velocity

3.0= u + -2.5(4)

3.0+2.5(4)=u

13.0 = u

Hence the initial velocity is 13.0 meters per seconds
You might be interested in
Answer lol! pls! !!!
kogti [31]

Answer:

Confused

Explanation:

more details

5 0
3 years ago
Read 2 more answers
What is the equation for momentum
Marina CMI [18]

Answer:

p=mv

Explanation:

i looked it up.

5 0
3 years ago
Read 2 more answers
If you are looking for a material that is a good conductor, you will look for a material that will (2 points)
Nataly_w [17]
B)<span>Readily accept electron flow.</span>
7 0
3 years ago
Read 2 more answers
The energy is water but i wanf to know how does it affect the enviorment?
Airida [17]
It affects the environment because more animals and plants will grow. Down side is if there are bugs or insects that need water to live, if there's more water than more bugs. If bugs also feed on plants there could be an over population. 
7 0
3 years ago
The 100-m dash can be run by the best sprinters in 10.0 s. A 66-kg sprinter accelerates uniformly for the first 45 m to reach to
irga5000 [103]

(a) 154.5 N

Let's divide the motion of the sprinter in two parts:

- In the first part, he starts with velocity u = 0 and accelerates with constant acceleration a_1 for a total time t_1 During this part of the motion, he covers a distance equal to s_1 = 45 m, until he finally reaches a velocity of v_1 = u + a_1t_1. We can use the following suvat equation:

s_1 = u t_1 + \frac{1}{2}a_1t_1^2

which reduces to

s_1 = \frac{1}{2}a_1 t_1^2 (1)

since u = 0.

- In the second part, he continues with constant speed v_1 = a_1 t_1, covering a distance of d_2 = 55 m in a time t_2. This part of the motion is a uniform motion, so we can use the equation

s_2 = v_1 t_2 = a_1 t_1 t_2 (2)

We also know that the total time is 10.0 s, so

t_1 + t_2 = 10.0 s\\t_2 = (10.0-t_1)

Therefore substituting into the 2nd equation

s_2 = a_1 t_1 (10-t_1)

From eq.(1) we find

a_1 = \frac{2s_1}{t_1^2} (3)

And substituting into (2)

s_2 = \frac{2s_1}{t_1^2}t_1 (10-t_1)=\frac{2s_1}{t_1}(10-t_1)=\frac{20 s_1}{t_1}-2s_1

Solving for t,

s_2+2s_1=\frac{20 s_1}{t_1}\\t_1 = \frac{20s_1}{s_2+2s_1}=\frac{20(45)}{55+2(45)}=6.2 s

So from (3) we find the acceleration in the first phase:

a_1 = \frac{2(45)}{(6.2)^2}=2.34 m/s^2

And so the average force exerted on the sprinter is

F=ma=(66 kg)(2.34 m/s^2)=154.5 N

b) 14.5 m/s

The speed of the sprinter remains constant during the last 55 m of motion, so we can just use the suvat equation

v_1 = u +a_1 t_1

where we have

u = 0

a_1  =2.34 m/s^2 is the acceleration

t_1 = 6.2 s is the time of the first part

Solving the equation,

v_1 = 0 +(2.34)(6.2)=14.5 m/s

3 0
3 years ago
Other questions:
  • The influence of likes and dislikes on thinking called?
    13·1 answer
  • A metal conduit will be used as a pathway for wiring through a concrete block. The conduit is a 4 foot long rod with an outer di
    13·2 answers
  • Two satellites are in circular orbits around Earth. Satellite A has speed vA. Satellite B has an orbital radius nine times that
    12·1 answer
  • A block of mass m=9.0 kg and speed V and is behind a block of mass M= 27 kg and speed of .50 m/s. The surface is frictionless, a
    14·1 answer
  • At what ratio will potassium and sulfur form a binary ionic compound
    15·1 answer
  • An object accelerates from rest to a velocity of 22 m/s over 35 m what was it’s acceleration
    12·1 answer
  • Whats potential energy?
    8·2 answers
  • A(n) 1946 kg car travels at a speed of 10 m/s . What is its kinetic energy ? Answer in units of J.
    14·1 answer
  • Sammy feels an ocean breeze as he plays volleyball at the beach. Why do ocean winds or sea breezes blow toward shore during the
    7·1 answer
  • PLEASE HELPPPPP
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!