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
QveST [7]
3 years ago
14

A sprinter moving at 10 m/s slows down at a rate of 1.4 m/s2. how fast is the runner moving after 4 seconds?

Physics
2 answers:
Tema [17]3 years ago
6 0

Answer:

vf= 4.4 m/s

Explanation:

Kinematics

Because the sprinter moves with uniformly accelerated movement we apply the following formula:

vf= v₀+at Formula (1)

Where:  

t : time in seconds (s)

v₀: initial speed in m/s  

vf: final speed in m/s  

a: acceleration in m/s²

Data

t = 4 s

v₀ = 10 m/s

a = -1.4 m/s²

Problem development

We replace data in the formula (1) to calculate the speed of the sprinter in 4 seconds :

vf = 10-1.4(4)

vf= 4.4 m/s

AURORKA [14]3 years ago
3 0
V=u+at
v=10+(-1.4 (4))
=10-5.6
=4.4m/s
You might be interested in
I need an answer asap
gulaghasi [49]
He has a mass of 56 kg.

The equation given is PE = mgh.

PE = 4620 J

h = 8.4

g = 9.8

Therefore:

4620 = 82.32m

m = 4620/82.32
m = 56 (rounded to two significant digits)
5 0
3 years ago
PLEASE HELP ASAP!! CORRECT ANSWER ONLY PLEASE!!
DaniilM [7]
The correct answer would be to express large and small numbers.
5 0
3 years ago
The tension in the horizontal towrope pulling a water-skier is 250 N while the skier moves due west a distance of 50 m. How much
icang [17]

Answer:

W = 250(50) = 12500 J

Explanation:

5 0
3 years ago
Please tell me the answer
maria [59]

Answer:

for which one

Explanation:

4 0
3 years ago
A 1.0 kg copper rod rests on two horizontal rails 1.0 m apart and carries a current of 50 A from one rail to the other.
vagabundo [1.1K]

Answer

given,

mass of copper rod = 1 kg

horizontal rails = 1 m

Current (I) = 50 A

coefficient of static friction = 0.6

magnetic force acting on a current carrying wire is

           F = B i L

Rod is not necessarily vertical

F_x =i L B_d

F_y= i L B_w

the normal reaction N = mg-F y

static friction       f = μ_s (mg-F y )

horizontal acceleration is zero

F_x-f = 0

iLBd = \mu_s(mg-F_y )

 B_w = B sinθ

 B_d = B cosθ

iLB cosθ= μ_s (mg- iLB sinθ)

B = \dfrac{\mu_smg}{i(cos\theta +\mu_s sin\theta)}

\theta =tan{-1}{\mu_s}

\theta =tan{-1}{0.6}

\theta = 31^0

B = \dfrac{0.6\times 1 \times 9.8}{50(cos31^0 +0.6 sin31^0)}

       B = 0.1 T

4 0
3 years ago
Other questions:
  • Are you ready for a brain twister? murphy can row at 5 kmph in still water. if the velocity of current is 1 kmph and it takes hi
    5·1 answer
  • Choose one of the six fitness related components that are used in gymnastics.
    13·1 answer
  • Light travels from crown glass (n=1:52) into air (n=1.00). The angle of refraction in
    11·1 answer
  • Joules are Nm, which is kg middot m^2/s^2 Use this relationship and 1 Btu = 1.0551 kJ to determine what Btu using primary Englis
    11·1 answer
  • A certain microwave has a
    10·1 answer
  • if a person can jump 2m in earth surface how high can he jump in the moon (g of moon = 1.66m/s, g of earth = 9.8 m/s) [hint: use
    8·1 answer
  • Elizabeth has always believed that people's thoughts can help heal them. She wants to help people use positive thinking to posit
    9·1 answer
  • Which material is a composite? A. gold B.silicon C.polycarbonate D.aluminum
    10·1 answer
  • Actiong-reaction of the bat hits the ball.
    10·1 answer
  • What important component is still scarce for American manufacturers, which had 40 days' worth before the pandemic but only had a
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!