All categories

3 years ago

.a car increases its speed from 10 m/s to 20/s in 2.5. seconds calculate it’s acceleration

Physics

1 answer:

Mekhanik [1.2K]3 years ago

3 0

Answer:

$\boxed {\boxed {\sf 4\ m/s^2}}$

Explanation:

Acceleration is the rate of change of an object with respect to time. It is the change in velocity over the time.

$a= \frac{v_f-v_i}{t}$

The car starts at 10 meters per second and increases to 20 meters per second in 2.5 seconds.

$v_f$ = 20 m/s
$v_i$ = 10 m/s
t= 2.5 s

Substitute the values into the formula.

$a= \frac{ 20 \ m/s - 10 \ m/s}{2.5 \ s }$

Solve the numerator.

$a= \frac{10 \ m/s}{2.5 \ s}$

Divide.

$a= 4 \ m/s/s$

$a= 4\ m/s^2$

The acceleration of the car is 4 meters per second squared.

You might be interested in

What is the correct classification of a mixture in which both a solid and a liquid are visible?

stepan [7]

The answer is a heterogeneous mixture. Mixtures can be homogeneous and heterogeneous. If a solid and a liquid of a mixture cannot be separated and the difference between them is not visible, it is called homogeneous mixture (or solution). If a solid and a liquid of a mixture are visible and can be separated easily, the mixture is called heterogeneous.

7 0

3 years ago

Read 2 more answers

slader the cross section of a 5-ft long trough is an isosceles trapezoid with a 2 foot lower base, a 3-foot upper base, and an a

Ostrovityanka [42]

Answer:

0.08 ft/min

Explanation:

To get the speed at witch the water raising at a given point we need to know the area it needs to fill at that point in the trough (the longitudinal section), which is given by the height at that point.

So we need to get the lenght of the sides for a height of 1 foot. Given the geometry of the trough, one side is the depth d and the other (lets call it l) is given by:

$l=\frac{3-2}{2}\,ft+2\,ft\\l=2.5\,ft$

since the difference between the upper and lower base is the increase in the base and we are only at halft the height.

Now we can calculate the longitudinal section A at that point:

$A=d\times l\\A=5\,ft \times 2.5\, ft\\A=12.5\, ft^{2}$

And the raising speed v of the water is given by:

$v=\frac{q}{A}\\v=\frac{1\, \frac{ft^3}{min}}{12.5\, ft^2}\\v=0.08\, \frac{ft}{min}$

where q is the water flow (1 cubic foot per minute).

7 0

4 years ago

How does a savanna differ from a grassland?

Pepsi [2]

Answer:

B. Savannas have shrubs and isolated trees, while grasslands contain grasses.

8 0

3 years ago

Read 2 more answers

PLEASE HURRY 20 PTS

Crank

Answer:

A. The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

Explanation:

The electric force exerted on a charge by an electric field is given by:

where

F is the force

q is the charge

E is the electric field

We see that if the charge is negative, q contains a negative sign, so the force F and the electric field E will have opposite signs (which means they have opposite directions). This is due to the fact that the direction of the lines of an electric field shows the direction of the electric force experienced by a positive charge in that electric field: therefore, a negative charge will experience a force into opposite direction.

5 0

3 years ago

How much power is used by a hair dryer if it does 40,000 J of work in 40 seconds?

bearhunter [10]

Answer:

40000÷40=1000 joules is required to work in 40 seconds

6 0

4 years ago