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2 years ago

Which option is an example of an object that has potential energy followed by an object that has kinetic energy?

1 answer:

6 0

A ball held over a person's head | a ball rolling on the floor is an example of an object that has potential energy followed by an object that has kinetic energy.

<h3>What is Kinetic energy?</h3>

This is the type of energy possessed by a body by virtue of its motion or movement.

The rolling ball therefore has kinetic energy while a ball being held over a person's head has potential energy which is the energy possessed by a body by virtue of its position.

Read more about Kinetic energy here brainly.com/question/8101588

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You might be interested in

1. A body has a velocity of 72 km/hr. Find its value in m/s.

CaHeK987 [17]

72 Km/hr

= 72000 m/ 60×60 s

= 72000 m/ 3600 s

= 20 m/s

Answer is 20 m/s.

Hope it helps! Please do comment

8 0

3 years ago

Determined to test the law of gravity for himself, a student walks off a skyscraper 180 m high, stopwatch in hand, and starts hi

Sati [7]

Answer:

a) v₀ = - 164.62 m / s , c) y = 122.5 m

Explanation:

We can solve this exercise using the free fall kinematic relations.

We put our reference system on the floor, so the height of the skyscraper is y₀ = 180m and the floor level is y = 0 m

For the boy

y = y₀ + v₀ t - ½ g t²

with free fall its initial speed is zero

y = ½ g t2

For superman

y = y₀ + v₀ (t-5) - ½ g (t-5)²

how superman grabs the lot just before hitting the ground

we look for the time it takes the boy down

t = √ (2 y₀ / g)

t = √ (2 180 / 9,8)

t = 6.06 s

in the equation for superman, we clear the volume and calculate

v₀ (t-5) = -y₀ + ½ g (t-5)²

v₀ (6.06 -5) = -180 + ½ 9.8 (6.06 -5)²

v₀ 1.06 = -174.49

v₀ = - 174.49 / 1.06

v₀ = - 164.62 m / s

the negative sign indicates that the initial speed is down

b) to graph the position of the two we use the table

t (s) Y_boy (m) Y_superman (m)

0 180 180

1 175.1 180

5 57.5 180

6 3.6 10.18

see attachment for the two curves

c) calculate the height that falls a lot in the 5 seconds (t = 5)

y = -1/2 g t²

y = ½ 9.8 5²

y = 122.5 m

for this height superman has not yet left the skyscraper, so the boy hits the ground

8 0

4 years ago

A boy rows a rowboat across a river. The boat moves at 4.3 m/s at a direction of 25°

NikAS [45]

East component: 3.9 m/s

South component: 1.8 m/s

Explanation:

We have to resolve the velocity vector along the east and south axis.

Taking east as positive x-direction and south as positive y-direction, the components of the velocity are given by:

$v_x = v cos \theta\\v_y = v sin \theta$

where

v = 4.3 m/s is the magnitude of the velocity

$\theta=25^{\circ}$ is the angle between the direction of the velocity and of the x-axis

Substituting into the equations, we find:

East component:

$v_x = (4.3)(cos 25^{\circ})=3.9 m/s$

South component:

$v_y = (4.3)(sin 25^{\circ})=1.8 m/s$

Learn more about vector components:

brainly.com/question/2678571

#LearnwithBrainly

5 0

4 years ago

What is current and si unit<br>

Art [367]

Answer:

The SI unit of current is ampere which measures the flow of electric charge across a surface at the rate of one coulomb per second.

5 0

3 years ago

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Tcecarenko [31]

So acceleration = (final velocity - initial velocity)/time

So (fv-iv)/t=a

(45-110)/4.5

Gives you (-130/9)km/h^2

You may have to convert the SI units so just follow my steps and change what must be changed

4 0

3 years ago

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