**Answer:**

kinetic energy will change by a factor of **1/2**

Option C) **1/2** is the correct answer

**Explanation:**

Given the data in the question;

we know that;

Kinetic energy = 1/2.mv²

given that mass of the object is doubled; m1 = 2m

speed is halved; v1 = V/2

Now, New kinetic energy will be; 1/2.m1v1²

we substitute

Kinetic Energy = 1/2 × 2m × (v/2)²

Kinetic Energy = 1/2 × 2m × (v²/4)

Kinetic Energy = 1/2 × m × (v²/2)

Kinetic Energy = 1/2 [ 1/2mv² ]

Kinetic Energy = **1/2** [ KE ]

Therefore; kinetic energy will change by a factor of **1/2**

Option C) **1/2** is the correct answer

The book's** initial speed **= 2.83 m/s

The **mass** of the textbook, m = 0.75 kg

The **final speed** of the textbook, v = 0 m/s (Since it comes to rest)

The **distance** covered by the book, d = 1.2 m

**Coefficient** of kinetic friction,

The** frictional force** between the **table** and the **book** is calculated as:

The **workdone** by the textbook is **calculated **as:

According to the work-kinetic energy** theorem**:

**Workdone** by the book = Change in **Kinetic energy**

The book's** initial speed **= 2.83 m/s

Learn more here: brainly.com/question/25459845

**Answer:**

The speed of light is constant for all observers

**Explanation:**

As per general postulate of relativity

- Lorentz covariance of special relativity becomes a local Lorentz covariance in the presence of matter.

So

light speed c is independent of States of matter

**Answer:**

High amplitude is equivalent to loud sounds.

**Explanation:**