All categories

3 years ago

A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?

Physics

1 answer:

olga55 [171]3 years ago

4 0

Answer:

17.6 m/s²

Explanation:

Given:

$v_{f}$ = 90 m/s (final velocity)

$v_{i}$ = 2 m/s (initial velocity)

Δt = 5s (change in time)

The formula for acceleration is:

$a_{avg}$ = Δv / Δt

We can find Δv by doing

Δv = $v_{f}$ - $v_{i}$

Replace the values

Δv = 90m/s - 2m/s

Δv= 88m/s

Using the equation from earlier, we can find the acceleration by dividing the average velocity by time.

$a_{avg}$ = Δv / Δt

$a_{avg}$ = $\frac{88m/s}{5/s}$

acceleration = 17.6 $m/s^{2}$

You might be interested in

Victoria has a crate of vegetables that weighs 100 newtons she exerts a force of 100 Newtons to lift the crate with a pulley wha

miskamm [114]

By definition, the mechanical advantage is the relationship that exists between the output force or load lifted and the value of the force applied.

Thus, using the definition, we have that the mechanical advantage is given by:

$MA = \frac{100}{100}\\MA = 1$

Therefore, the mechanical advantage of lifting the box by using a pulley is equal to 1.

Answer:

The mechanical advantage in this situation is:

Equal to 1

3 0

4 years ago

Read 2 more answers

Consider a metal single crystal oriented such that the normal to the slip plane and the slip directions are at angles of 43.1° a

Bond [772]

Answer:

resolve shear stress = 22 MPa

Explanation:

Given data

slip plane α = 43.1°

slip directions β = 47.9°

shear stress = 20.7 MPa (3,000 psi)

applied stress =45 mPa (6,500 psi)

to find out

what stress will be necessary

solution

we know that

resolve shear stress = aplied stress × cosα × cosβ

resolve shear stress = 45 × cos(43.1) × cos(47.9)

resolve shear stress = 22 MPa

we can say that here single cristal will be yield

because resolve shear stress is bigger than critical shear stress

3 0

4 years ago

Marta , who is only 5years old , heard her mother use a curse word and is now repeating that word much to the embarrassment of h

hjlf

Is there a pic I could maybe see of it!

8 0

3 years ago

Suppose that the amount of time it takes to build a highway varies directly with the length of the highway and inversely with th

Nezavi [6.7K]

Answer:

W = 5 miles

Explanation:

Work done by 200 worker in 3 week is equivalent to build 2 miles highway

So we will have

work done by each worker in 3 week is equivalent to

$W_1 = \frac{2 miles}{200}$

$W_1 = \frac{1}{100} mile/worker$

now work done in each week is given as

$w = \frac{1}{100 \times 3 week}$

$w = \frac{1}{300} miles/(person\times week)$

now we have to find the work done by 250 workers in 6 weeks

so we will have

$W = \frac{1}{300} \times 6 \times 250 miles$

$W = 5 miles$

8 0

3 years ago

Waves can be refracted.<br> Explain this term.<br><br><br> HELP PLSSS

Xelga [282]

Answer: By "waves can be refracted" they mean that refraction can occur with waves. To better explain, refraction is the "change in direction of a wave passing from one medium to another or from a gradual change in the medium." You probably know this best when you put a pencil inside a glass of water where the pencil bends a bit. The same can happen with sound or water waves as well!

Would appreciate brainly <3

6 0

2 years ago

Read 2 more answers