Use one of the equations of motion under gravity.
s = ut + 1/2 gt^2 where s = distance, u = initial speed , t = time and g = acceleration due to gravity ( = 9.8 ms^-2)
Initial downward speed is zero so we have
19.6 = 0t + 1/2 * 9.8 t^2
4.9t^2 = 19.6
t^2 = 19.6/4.9 = 4
t = 2 seconds (answer)
Straight line equation has a general form of

Where m is the slope

and c is the y intercepted part.
So now, you need to find the value of the slope (m) and the y intercept (c).
As you can notice the line intercepts with y axis in (0,1) So c=1.
And then you want to find 2 points along that line to found the slope from, we found on already (0,1) and the other one can be any point along the line, let's take (2,3).
Then use them to find the slope.

So now
m=1 and c=1.
The equation of this line is y=x+1
Hope this helps!
Answer: The slope of the line is -1/4 and the y intersect of the line is 9. Hope this helps!
Step-by-step explanation:
Answer:
$11.49
Step-by-step explanation: