Answer:
The height of the building is approximately 156.58 m
Explanation:
The mass of the ball dropped from rest from the building top = 0.660 kg
The time in which the ball falls, t = 5.65 seconds
The height, h, of the building is given from the following equation of motion;
h = u·t + ¹/₂·g·t²
Where;
u = The initial velocity of the ball = 0 m/s
g = The acceleration due to gravity = 9.81 m/s²
Plugging in the values, we have;
h = 0 × 5.65 + ¹/₂ × 9.81 × 5.65² ≈ 156.58 m
The height of the building, h ≈ 156.58 m.
 
        
             
        
        
        
Answer:
d. Two soccer balls that are touching each other
Explanation:
Let  be the mass of a tennis ball,
 be the mass of a tennis ball,  is the mass of a soccer ball.
 is the mass of a soccer ball.
As the mass of a soccer ball is more than the mass of a tennis ball, so

Let  be the distance between the centers of both the balls near each other and
 be the distance between the centers of both the balls near each other and  be the distance between the centers of both the balls touching each other.
 be the distance between the centers of both the balls touching each other.
So, 
The gravitational force, F, between the two objects having masses M and m and separated by distance d is

Where G is the universal gravitational constant.
As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them,  so selecting the larger mass ( , soccer ball) separated by a lesser distance (
, soccer ball) separated by a lesser distance ( , touching) to get more gravitational force.
, touching) to get more gravitational force.
Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.
Hence, option (d) is correct.
 
        
             
        
        
        
The answer is true. A person can only see object placed at 40 cm from him.
Hope I helped. ^-^
Mark as brainliest