Answer:
1 hour
Explanation:
Since the definition of velocity is
, we can calculate the position at time t of an object moving at speed v with
.
The position of the first ferry is 
The position of the second ferry is 
We want to know when they will be 6 miles apart. This means, if we call that distance d, that we want to know when the difference between their positions will be d, or
(we know that at the beginning the position of the ferry 1 is of higher value than that of ferry 2 since it left before).
We use our previous formulas then:

Since we want the time, we do:

And substitute our values:

The answer is 175184.08 joules
The answer is B. Force=mass X accleration
Answer:
c). 
Explanation:
As we know that weight of the automobile is given here
so weight = mass times gravity



now from Newton's law



