Based on your question where a car leaves skid marks 85m long on the highway nad getting to stop. The deceleration of the car is 3m/s^2 to estimate the speed of the car just before braking first is to analyze the problem then apply the necessary formulas. the possible answer is  510m/s
        
             
        
        
        
A the stamen :)). haha yea smert
        
                    
             
        
        
        
Newton's<span> first </span>law of motion<span> has been frequently stated throughout this lesson. An</span>object<span> at rest stays at rest and an </span>object<span> in </span>motion<span> stays in </span>motion<span> with the same speed and in the same direction unless </span>acted<span> upon by an </span>unbalanced force<span>.</span>
        
                    
             
        
        
        
Answer:
Nora's boat is moving towards Sam at 5 km/hr 
Explanation:
The question says that Nora is few meters behind Nancy and is still with respect to her that means the relative velocity between Nora and Nancy is zero
Vrel = 5 - Vnora= 0 ⇒ Vnora = 5km/hr
Pictorially we can represent the given condition as:
Nora-------few meters------Nancy -----------------    Sam
5km/hr                                         5km/hr →
Hence,  Nora's boat is moving towards Sam at 5km/hr. 
 
        
                    
             
        
        
        
If the tension in the rope is 160 n, - 43200 J work doen by the rope on the skier during a forward displacement of 270 m.
Given,
Tension force in the rope is (T) = 160 N
Displacement of the skier (S) = 270 m
The displacement takes place in forward direction while the direction of the tension in the rope is opposite to it.
Therefore, work done by the rope on  the skier is,
    
⇒
Hence work done by the rope is - 43200 J.
Learn more about force problems on 
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