Physics, 03.07.2019 00:30 eharris2694

Urgent. with acceleration equation problems.

Answers: 1

Show answers

Answers

Answer from: iiMxlissaii

(a) See graph in attachment.

The speed decreases from 45 m/s to 25 m/s after 4 seconds, as stated in the text of the problem.

(b) See graph in attachment.

In a distance-time graph, the slope of the graph corresponds to the speed of the object. In this case, we know that the speed is decreasing, so this is why the slope of the curve decreases.

The acceleration of the object is constant, because the speed decreases uniformly, so in an acceleration-time graph it corresponds to a flat line. Also, it has a negative value, since it is a deceleration (the speed is decreasing).

(d) -5 m/s^2

The value of the acceleration of the car is given by:

$a=\frac{\Delta v}{t}$

where $\Delta v=v_f-v_i$ is the change in velocity of the car, and t is the time taken. Substituting numbers, we find

$a=\frac{v_f-v_i}{t}=\frac{25 m/s-45 m/s}{4 s}=-5 m/s^2$

(e) v(t)=45-5t

The speed at time t of a car in a uniform accelerated motion is given by

v(t)=v_0 + at

where v0 is the initial speed, a is the acceleration and t is the time. In this problem, v_0=45 m/s and a=-5 m/s^2 , so we can substitute the numbers into the equation and we obtain

v(t)=45 -5t

(f) 35 m/s

Since the acceleration is constant, the average speed of the car can be calculated by using the following formula:

$v=\frac{v_f+v_i}{2}$

where vf and vi are the final and initial speeds. In this case, v_f=45 m/s and v_i=25 m/s , so the average speed is

$v=\frac{45 m/s+25 m/s}{2}=35 m/s$

(g) 140 m

We can calculate the distance traveled by using two different formulas:

1) $S=v_0 t + \frac{1}{2}at^2$

where v0=45 m/s is the initial speed, a=-5 m/s^2 is the acceleration and t=4 s is the time. Substituting, we obtain

$S=(45 m/s)(4 s)+\frac{1}{2}(-5 m/s^2)(4 s)^2=140 m$

2) $S=v_{avg} t$

where $v_{avg}=35 m/s$ is the average speed calculated previously, and t=4 s is the time. Using this formula, we find

S=(35 m/s)(4 s)=140 m

Urgent. with acceleration equation problems.

Answer from: Quest

s the environmental science is a broader field that incorporates many elements of earth and life sciences, whereas ecology is usually more focused on how organisms interact with each other and their surroundings, and often on a very specific population of living things. soo yea

explanation:

Answer from: Quest

Cin carbonh in hydrogeno in oxygen

Other questions on the subject: Physics

Physics, 22.06.2019 10:00, issaaamiaaa15

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Answers: 2

continue

Physics, 22.06.2019 19:50, naidaisha18

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)

Answers: 1

continue

Physics, 22.06.2019 19:50, aliami0306oyaj0n

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory

Answers: 1

continue

Physics, 23.06.2019 02:00, lashayl27

Elements that have one valence electron and are very reactive are called

Answers: 1

continue

You know the right answer?

Urgent. with acceleration equation problems.
...