A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/s .If the cart has an initial speed of of 2.0 m/s ,what's its final speed.

Answers

Answer 1

Answer:

A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/s .If the cart has an initial speed of of 2.0 m/s and its final speed is calculated as 22m/s.

Given data is,

Time t = 5 seconds

Acceleration a = 4 m/s

Initial speed u = 2 m/s.

What is velocity?

Velocity is defined as the rate of change of object's position with some function of time.

Mathematically, Velocity can be defined by the ratio of distance and time.

Velocity = Distance/ time.

The velocity after a certain time of acceleration can be described with the formula as,

V = u + at

where, v is the final velocity,

u is the initial velocity,

a is the acceleration,

t is the time.

Substituting all the given values in the formula,

V = 2 + ( 4x5)

= 2 + 20

V = 22m/s

The final velocity of a cart rolling down can be calculated as 22 m/s.

To know more about the velocity,

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Answer 2

Answer:

Answer: solve it with the following formula:

Vf = Vi + at

Final velocity = initial velocity + ( acceleration × time)

Explanation:

Putting the values

Vf = 2.0m/s+ 4.0m/s²× 5.0s

Vf = 2.0m/s +20.0 m/s (m/s² × s = m/s)

Vf = 22.0 m/s

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Answer:

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Answers

The answer then is false, if it has a trait that will help it survive in its environment then it will pass on the trait to its offspring.

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EGDE 2021

A ball of mass 2 kg is kept on the hill of height 3 km. Calculate the potential energy possessed by it ?How can I get the potential energy ?

Answers

We know that -

$P.E=m*g*h$

Where,

$m = mass$

$g = acceleration$ $due$ $to$ $gravity$

$h=height$

First we convert height into meters.

1 km = 1000 meters

3 km = 1000 * 3 meters = 3000 meters

So, putting the values in the above formula, and by taking 'g' = 9.8 m/s², we get-

$P.E.= 2*3000*9.8$

$P.E.= 58800$ $Joules$

$P.E.= 58.8$ $kJ$

Sairah's work is correct as far as it goes. The potential energy of the ball
relative to the bottom of the hill is 58,800 Joules.

To address the second part of the question:
In order to get ahold of that energy, the ball must be returned to the bottom
of the hill. The most efficient way would be to drop it, so that it wouldn't have to
scrape along the grass on the way down. But that can only work if there's a sheer
cliff on one side of the hill. Otherwise, you just have to roll it down, and accept the
fact that it loses some of its energy to friction on the way.

However the ball gets to the bottom, the energy it has left shows up in the form
of kinetic energy, and 58,800 joules is a lot of kinetic energy. If somehow the ball
could arrive at the bottom with ALL the energy it had at the top, it would be moving
at something like 540 miles per hour !

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4 becomes less dense when it freezes

Answers

The answer is statement 4. This is the most unique property of water since most materials becomes more dense when it undergoes transition from liquid to solid. However, this is not the case of water. When water freezes it becomes less dense because the hydrogen bonds causes the molecule to push each other farther apart.

Answer:

The answer is D:becomes less dense when it freezes.

Explanation:

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