When Sam presses the brake lever, a pair of rubber shoes clamps onto the metal inner rim of the front and back wheels. As the brake shoes rub against the wheels, friction is caused and the kinetic energy possessed by the vehicle is converted into heat which slows down the vehicle.

**Answer:**

4m/s

**Explanation:**

**due to newtons second law of motion**

the accelerations that result when a 12-N net force is applied to a 3-kg object. A 3-kg object experiences an acceleration of 4 m/s/s.

HOPE THIS HELPS PLEASE MARK AS BRAINLIEST:)

**Answer:**

a) {[1.25 1.5 1.75 2.5 2.75]

[35 30 25 20 15] }

b) {[1.5 2 40]

[1.75 3 35]

[2.25 2 25]

[2.75 4 15]}

**Explanation:**

Matrix H: {[1.25 1.5 1.75 2 2.25 2.5 2.75]

[1 2 3 1 2 3 4]

[45 40 35 30 25 20 15]}

Its always important to get the dimensions of your matrix right. "Roman Columns" is the mental heuristic I use since a matrix is defined by its rows first and then its column such that a 2 X 5 matrix has 2 rows and 5 columns.

Next, it helps in the beginning to think of a matrix as a grid, labeling your rows with letters (A, B, C, ...) and your columns with numbers (1, 2, 3, ...).

For question a, we just want to take the elements A1, A2, A3, A6 and A7 from matrix H and make that the first row of matrix G. And then we will take the elements B3, B4, B5, B6 and B7 from matrix H as our second row in matrix G.

For question b, we will be taking **columns** from matrix H and making them **rows **in our matrix K. The second column of H looks like this:

{[1.5]

[2]

[40]}

Transposing this column will make our first row of K look like this:

{[1.5 2 40]}

Repeating for columns 3, 5 and 7 will give us the final matrix K as seen above.

Question: What happens to potential energy when a skier goes down the hill?

Answer: Decrease

Explanation: As the skier begins the descent down the hill potential energy is lost and kinetic energy is going to start acting

question answered by

(jacemorris04)

The difference is one is a written formula that describes a molecule, the other is a visual representation of the molecule. for example the hydrocarbon butane has a molecular formula of C4H10, whereas the molecular model would depict 4 Carbon atoms (either represented by colour coded dots or the letter C) with single bonds (one straight line) connecting them to the 10 Hydrogen atoms (either differenly coloured dots or a H)