Answer:
hope it helps for you
Explanation:
A machine is an object or mechanical device that receives an input amount of work and transfers the energy to an output amount of work. For an ideal machine, the input work and output work are always the same. The six common simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.
Initially, the spring stretches by 3 cm under a force of 15 N. From these data, we can find the value of the spring constant, given by Hook's law:

where F is the force applied, and

is the stretch of the spring with respect to its equilibrium position. Using the data, we find

Now a force of 30 N is applied to the same spring, with constant k=5.0 N/cm. Using again Hook's law, we can find the new stretch of the spring:
Refer to the diagram shown below.
Let x = distance of the base of the ladder from the base of the hill.
By definition,
sin(75°) = x/15
x = 75*cos(75°) = 3.882 ft
Answer:
The distance between the base of the hill and the base of the ladder is 3.9 ft (nearest tenth)