physics.

A car that weighs 15,000 N is initially moving at 60 km/hr when the brakes are applied. The car is brought to a stop in 30 m. Assuming the force applied to the brakes
is constant, determine the magnitude of the braking force.
2.
An isosceles triangle has sides
of length x, x and y. In addition, assume the
triangle has perimeter 12.
a.) Find the rule for a function that computes the area of the triangle as a function of x. Describe the largest possible domain.
I’ve got the answer which is 2(6-x) (sqrt 3x – 9) for the area
but i don’t know what the domain is, how do I find the domain? Do I plug in points?
b.) Assume that the maximum value of the
function a(x) in (a) occurs when x = 4.
Find the maximum value of z = a(x) and
z = 2a(3x + 3) + 1.
Apparently the answer is Max of a(x) is 4v3 and max of 2a(3x + 3) + 1 is 8v3 + 1 (when x =1/3).
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