Answer:
300000 J / 400 J/s = 750 s = 12.5 minutes
Explanation:
 
        
             
        
        
        
Answer:
 
5 I think will be none of the above and 6 could be all of the above
 
        
             
        
        
        
Answer:
V = 4.63 m/s
V = 11.31 m/s
Explanation:
Given,
The distance traveled by the bus, towards north, d = 2.5 km
                                                                                      = 2500 m
The time taken by the trip is, t = 9 min
                                                   = 540 s
The velocity of the bus,
                                        V = d / t
                                            = 2500 / 540
                                            = 4.63 m/s
At another  point, the bus travels at a constant speed of v = 18 m/s
Therefore the velocity becomes
                                                 V = (4.63 + 18)/2
                                                    = 11.31 m/s
Hence, the velocity of the  bus, V = 11.31 m/s