Answer: a switch can do A, B and E
Explanation:
In a displacement/time graph, the slope of the line is equal to the velocity
Answer:
At an angle of 
Explanation:
Assume the river flows from East to West so for the swimmer to cross across it, assume he crosses it from West to East.
The resultant speed will be given by

Answer:
hope this was good for u and I believe it would be solid
The answer to this question is B I think