Jasper, because he developed friendships playing with everyone last year,
Thats the answer
        
                    
             
        
        
        
Answer 1) : 62.5 km/hour is the average velocity of the train.
2) The final velocity of the car at the end of 75 m is 14.69 m/s
Explanation:
1) Displacement of the train = 100 km + 150 km = 250 km
Total time train took =1 hour 15 min+ 45 min + 2 hours = 240 min = 4 hours
Average velocity=
62.5 km/hour is the average velocity of the train.
2) The acceleration of the car, a= 1.2 
Distance covered by the car,s = 75 m
Initial velocity of the car , = 6 m/s
 = 6 m/s
Final velocity of thre car , =?
=?
Using third equation of motion:


The final velocity of the car at the end of 75 m is 14.69 m/s
 
        
             
        
        
        
Erosion, weathering, mechanical changes, chemical changes. 
Really, any interaction can change the composition of a rock whether it be done by man or through nature. 
 
        
                    
             
        
        
        
Answer:
5 m/s
Explanation:
Here we can see there is no external force acted on a two masses when we consider the motion. If there is no external forces then momentum is conserved. 
Initial momentum = Final momentum 
0.5 × 10  = 1 × V
V = 5 m/s