Why do truckers use a ramp when loading a truck if the work required is the same with or without a ramp?

It takes a truck 3.56 seconds to slow down from 112 km/h to 87.4 km/h. What is its average acceleration?

maxonik [38]

Answer:

option B

−1.92 m/s2

Explanation:

Given in the question,

time took by truck to slow down = 3.56 sec

initial speed of truck = 112 km/h

final speed of truck = 87.4 km/h

1 km/h = 0.277778 m/s

112 = 31.1 m/s

87.4 = 24.28 m/s

Formula use to calculate the acceleration

v - u = at

where v is final speed

u is initial speed

a is acceleration

t is time

plug values in the equation

24.28 - 31.1 = a(3.56)

-6.8 = a(3.56)

a = -6.8 / 3.56

a = -1.9 m/s²

3 0

4 years ago

The difference between the observed points and the regression line points is equal to the:________

pshichka [43]

The difference between the observed points and the regression line points is equal to the correlation.

The strength and direction of a relationship between two or more variables are described by the statistical measure of correlation, which is given as a number. However, a correlation between two variables does not necessarily imply that a change in one variable is the reason for a change in the values of the other.

Regression expresses the relationship as an equation, whereas correlation assesses the strength of the linear link between two variables. The square of the correlation coefficient, also known as Pearson's r, between the observed and predicted values in a regression is sometimes referred to as R2.

Learn more about correlation here;

brainly.com/question/6563788

#SPJ4

8 0

2 years ago

Speed acceleration question.

PIT_PIT [208]

This doesn’t make sense

4 0

3 years ago

Una esfera homogénea de radio r y peso W resbala en un piso bajo la acción de una fuerza horizontal constante P aplicada a una c

bearhunter [10]

Garlic Butter Shrimp Scampi can be enjoyed as an appetizer/light meal OR for dinner with your favourite pasta of choice! You can also keep it low carb and serve over zucchini noodles or with steamed cauliflower! Either way it’s delicious and even better than an Italian restaurant Scampi!

4 0

3 years ago

Two fishing boats depart a harbor at the same time, one traveling east, the other south. the eastbound boat travels at a speed 3

kaheart [24]

1) Let's call $V_S$ the speed of the southbound boat, and $V_E=V_s+3~mph$ the speed of the eastbound boat, which is 3 mph faster than the southbound boat. We can write the law of motion for the two boats:
$S_E(t)=V_E t=(V_S+3)t$
$S_S(t)=V_S t$

2) After a time $t=3~h$ , the two boats are $45~mi$ apart. Using the laws of motion written at step 1, we can write the distance the two boats covered:
$S_E(3~h)=3(V_S+3)=3V_S+9$
$S_S(3~h)=3V_S$
The two boats travelled in perpendicular directions. Therefore, we can imagine the distance between them (45 mi) being the hypotenuse of a triangle, of which $S_E$ and $S_S$ are the two sides. Therefore, we can use Pythagorean theorem and write:
$45= \sqrt{(3V_S)^2+(3V_S+9)^2}$
Solving this, we find two solutions. Discarding the negative solution, we have $V_S=9~mph$ , which is the speed of the southbound boat.

4 0

3 years ago