Answer:
v = 98.75 km/h
Explanation:
Given,
The distance driver travels towards the east, d₁ = 135 km
The time period of the travel, t₁ = 1.5 h
The halting time, tₓ = 46 minutes
The distance driver travels towards the east, d₂ = 215 km
The time period of the travel, t₁ = 2 h
The average speed of the vehicle before stopping
                                     v₁ = d₁/t₁
                                         = 135/1.5
                                         = 90 km/h
The average speed of vehicle after stopping
                                     v₂ = d₂/t₂
                                          = 215/2
                                          = 107.5 km/h
The total average velocity of the driver
                                       v = (v₁ +v₂) /2
                                          = (90 + 107.5)/2
                                          = 98.75 km/h
Hence, the average velocity of the driver, v = 98.75 km/h
 
        
             
        
        
        
Answer:
7.6 s
Explanation:
Considering kinematics formula for final velocity as

Where v and u are final and initial velocities, a is acceleration and s is distance moved.
Making v the subject then

Substituting 8.8 m/s for u, 138 m for s and 2.45 m/s2 for a then

Also, v=u+at and making t the subject of the formula

Substituting 27.45 m/s for v, 8.8 m/s for u and 2.45 m/s for a then

Therefore, it needs 7.6 seconds to travel
 
        
             
        
        
        
There are several possibilities.  Here are a few that occur to me:
--  If Point-A is the summit of Pike's Peak, he may feel somewhat 
short of breath. 
-- If Point-A is his grandmother's house, he may feel a great sense 
of pleasant anticipation.
-- If Point-A is his office on Monday morning, then he may feel
a tightening sensation in his chest.;
-- If Point-A is his home on Friday afternoon, then he feels the
effects of a slow and steady drop in his blood pressure.
I finer point might be put to it if we had any idea of where 
Point-A is, and what it represents in the grand scheme 
of things.
        
             
        
        
        
Answer:

Explanation:
The constant speed means that ball is not experimenting acceleration. This elements is modelled by using the following equation of equilibrium:


Now, the exerted force is:

The volume of a sphere is:



Lastly, the force is calculated:

