**Answer:**

Yes.

**Explanation:**

With no extra force acting upon it, it is a still object.

Like laying flat on a bed of nails. With no force pushing you down besides gravity, you will not cut yourself.

Correct answer is:

<span>B. Subtract the initial velocity from the final velocity and divide the result by the time

In fact, the formula to calculate the acceleration is

</span>

<span>where vf is the final velocity, vi the initial velocity, and t the time.</span>

Answer:

Silver.

Explanation:

To determine the identity of the metal, we need to calculate the density of the metal. This is illustrated below:

Mass of metal (m) = 18.15g

Length (L)= 1.2cm

Volume (V) = L³ = 1.2³ = 1.728cm³

Density =.?

The density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, it is expressed as:

Density = Mass /volume

With the above formula, we can obtain the density of the metal as follow:

Mass = 18.15g

Volume = 1.728cm³

Density =.?

Density = Mass /volume

Density = 18.15g/1.728cm³

Density of the metal = 10.50g/cm³

Comparing the density of metal obtained with the densities given in the table above, we can see that the density of the metal is the same with that of silver.

Therefore, the metal is silver.

**Answer:**

**5.994 kgm/s**

**Explanation:**

Momentum: This can be defined as the product of the mass of a body to the velocity of that body. The S.I unit of momentum is kgm/s.

Mathematically, momentum can be expressed as,

M = mv.................................... Equation 1

Where M = momentum of the baseball, m = mass of the baseball, v = velocity of the baseball.

**Given: m = 155 g = (155/1000) kg = 0.155 kg. v = 87 miles per hour = 87(1600/3600) m/s = 38.67 m/s.**

**Substituting into equation 1**

M = 0.155(38.67)

**M = 5.994 kgm/s.**

**Thus the momentum of the baseball = 5.994 kgm/s**