**Answer:**

Maximum height: 20.4 m, height at 30 s: -274 m

**Explanation:**

If you want to find the height of the ball after 30 seconds, we must use the equation:

where

u = 20 m/s is the initial velocity

a = g = -9.8 m/s^2 is the acceleration of gravity

t is the time

Substituting t = 30 s,

This means that the ball is 274 m below its original level.

If you want to find the maximum height, then it can be find by using the law of conservation of energy: in fact, at the maximum height, all the initial kinetic energy has been converted into potential energy, so

And solving for h, we find the maximum height:

1.2 percent of 155 million is 1,860,000. Divide that by 12 (for twelve months of the year) and get 155,000. That's the answer. 155,000.

Answer:

this sound wave get to the other by either undergoing either reflection,absorption or transmission

Explanation:

When a sound wave meets an obstacle, some of the sound is reflected back from the front surface and some of the sound passes into the obstacle material, where it is absorbed or transmitted through the material like the building walls

Thus, Reflection and absorption are dependent on the wavelength of the sound. Hence percentage of the sound transmitted through an obstacle depends on how much sound is reflected and how much is absorbed.

**Answer:**

The magnitude of the magnetic field is .

**Explanation:**

Given that,

Charge,

Speed of the charged particle,

The angle between the velocity of the charge and the field is 56°.

The magnitude of force,

We need to find the magnitude of the magnetic field. When a charged particle moves in the magnetic field, the magnetic force is experienced by it. The force is given by :

B is the magnetic field.

**So, the magnitude of the magnetic field is ****. Hence, this is the required solution. **

It says: The bigger the distance between objects the smaller the gravity between them.