Answer:
Option (C) is correct.
Explanation:
Assuming that the hiker starts walking from the origin O as shown in the figure.
First, he walks 200 m west to point A (say), then he walks 100 m north to the final point B (say) as shown in the figure.
The final point B is in the north-west direction, therefore, the resulting point is in the north-west direction.
Hence, option (C) is correct.
 
        
             
        
        
        
Answer:
 15s
Explanation:
Given parameters: 
Distance traveled  = 375m 
Speed = 25m/s 
Unknown: 
Time taken = ? 
Solution: 
To solve this problem, we make time the subject of the speed equation. 
     Speed  =  
   
   Time  =  
  
  Now insert the parameters and solve; 
   Time  =  = 15s
   = 15s
 
        
             
        
        
        
Since Astronaut and wrench system is isolated in the space and there is no external force on it
So here momentum of the system will remain conserved
so here we can say

initially both are at rest
so here plug in all values


so here the astronaut will move in opposite direction and its speed will be equal to 0.20 m/s
 
        
             
        
        
        
Well first of all, the Space Shuttle program ended a few years ago, and none have been launched since then.
The Shuttle never went to places that were properly referred to as "outer space". When they flew, the Space Shuttles went to low Earth orbit, where the acceleration of gravity is roughly 85% of its value on the Earth's surface.
So a Shuttle that weighed 20 million Newtons on the launch pad weighed roughly  17 million Newtons while in orbit.