Well if the rock doesn't move, then there is no amount of work done. There is no work done on an object if a force is applied to the object but it DOES NOT change its position, in this case is the rock.
        
             
        
        
        
Answer:
Bar magnets are permanent magnets. This means that their magnetism is there all the time and cannot be turned on or off as it can with electromagnets .
Explanation:
 
        
             
        
        
        
answer 
 so unit of velocity is m/s
 displacement=600m
 5minutes should be converted to seconds
 5×60=300 seconds
 so,
 velocity= displacement÷time
 = 600m ÷300s
 =2m/s or 2ms^-1
 
        
                    
             
        
        
        
D = distance between the cars at the start of time = 680 km
v₁ = speed of one car 
v₂ = speed of other car = v₁ - 10
t = time taken to meet = 4 h
distance traveled by one car in time "t" + distance traveled by other car in time "t" = D 
v₁ t + v₂ t = D 
(v₁ + v₂) t = D
inserting the values 
(v₁ + v₁ - 10) (4) = 680
 v₁ = 90 km/h
rate of slower car is given as 
v₂ = v₁ - 10
v₂ = 90 - 10 = 80 km/h