Answer:
100N
Explanation:
Newton's third law of motion
For every action, there is an equal and opposite reaction.
Therefore 100N of force is exerted by the crate on student as a reaction to his action
 
        
             
        
        
        
Question 2 is because the passengers have inertia, which is a tendency to resist change in motion
        
             
        
        
        
Answer:
3.71 m/s
Explanation:
From the law of conservation of linear momentum, since we are neglecting minor energy losses due to friction then we can express it as 
 since all the potential energy is transformed to kinetic energy
Making v the subject of the formula then 
 and here m is the mass of the block, g is acceleration due to gravity, h is the height. Substituting 0.7 m for h and 9.81 for g then we obtain that 
 
        
             
        
        
        
Answer:
primary source
Explanation:
the explanation is in the image above 
brainliest please