In order to solve the problem, it is necessary to apply the concepts related to the conservation of momentum, especially when there is an impact or the throwing of an object.
The equation that defines the linear moment is given by

where,
m=Total mass
Mass of Object
Velocity before throwing
Final Velocity
Velocity of Object
Our values are:

Solving to find the final speed, after throwing the object we have

We have three objects. For each object a launch is made so the final mass (denominator) will begin to be subtracted successively. In addition, during each new launch the initial speed will be given for each object thrown again.
That way during each section the equations should be modified depending on the previous one, let's start:
A) 



B) 



C) 



Therefore the final velocity of astronaut is 3.63m/s
Answer:
50 Mph.
Explanation:
According to the National Severe Storms Laboratory, winds can really begin to cause damage when they reach <em><u>50 mph</u></em>. But here’s what happens before and after they reach that threshold, according to the Beaufort Wind Scale (showing estimated wind speeds): - at 19 to 24 mph, smaller trees begin to sway.
Velocity of swimmer across river = 1.30 m/s
Distance arrived downstream = 48 m
Width of river = 64 m
Time taken to cross river = 
= 
Speed of river current = 
= 
So, the river is flowing at a speed 0.975 m/s.
Answer:
a) 
b) 
Explanation:
From the exercise we know that



From dynamics we know that the formula for average velocity is:

a) For the three intervals:



b) The average velocity for the entire motion can be calculate by the following formula:

Answer:
324795 C
252.637820565 N/C

Explanation:
= Permittivity of free space = 
R = Radius of Mars = 
A = Area = 
= Electric flux = 
Electric flux is given by

The charge is 324795 C
Electric field is given by

The electric field is 252.637820565 N/C
Surface charge density is given by

The surface charge density is 