Chemistry High School

A ball is thrown upward as shown. Gravity pulls (accelerates) the ball back down. Which of the following statements is true?

Velocity and acceleration are both positive.


Velocity is negative and acceleration is positive.


Velocity is positive and acceleration is negative.


Velocity and acceleration are both negative.

Answers

Answer 1

Answer:

I think third one is the right answer

Explanation:

if it is right please mark me as brainliest

Answer 2

Answer:velocity is positive

acceleration negative?

Explanation:

Related Questions

A signal is sent from a nerve cell to a muscle cell.
What is this an example of?
A:Meiosis
B:Cellular respiration
B:intracellular communication
D:intercellular communication
PLEASE HELP

Answers

Answer:

D:intercellular communication

Explanation:

Cellular respiration and meiosis have nothing to due with communication between cells. Intracellular communication is communication within the cell, leaving intercellular communication left as the correct answer.

How many moles are in a 111.5 gram sample of sodium chloride, NaCl?

Answers

Answer: 1.91 moles

Explanation:

First you want to find the molar mass of NaCL

Na = 22.99g  Cl = 35.45g

22.99g + 35.45g = 54.44g

Then divide 111.5g by 54.44g and this will give you moles.

Which has the greater N-O bond length, NO 2 -1 or NO 3 -1 ?

Answers

Answer:

NO 2-1

Explanation:


What action is modeled by the diagram? Explain

Answers

Answer
A one acción in the diagram is .....

The action modeled by the diagram is; flow of ions ( cations and anions ) in a cell/compound

The diagram is used to represent the flow of control ( flow of ions ) in a system, it is similar to a data flow diagram, because the start, direction and endpoint of an activity diagram is the similar to that of a data flow diagram. Activity diagrams are also used to generally describe the steps in a use case system as seen in the diagram attached in the question.

Hence the diagram ( activity ) represents the flow of ions in a compound

learn more : https://brainly.com/question/16610518

PLEASE HELP!!!
A piece of wood has a mass of 2.85 g; when placed in 20.0 mL of water, the water volume increased to 23.4 mL. What is the density of this piece of wood?

_______ Answer _______Units

Answers

Answer:

d = 0.84 g/cm³

Explanation:

Given data:

Mass of wood = 2.85 g

Volume of water = 20.0 mL

Volume of water + wood = 23.4 mL

Density of wood = ?

Solution:

Volume of wood = (Volume of water + wood ) - Volume of water

Volume of wood = 23.4 mL - 20.0 mL

Volume of wood = 3.4 mL

1 mL = 1 cm³

Density of wood:

d = m/v

d =  2.85 g / 3.4cm³

d = 0.84 g/cm³

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