Stone with a mass of 85 kg. is lifted upwards with a 2.5 m long bar. There is a smaller stone below the bar as a support point at a distance of 0.45 m from the end of the rock. Calculate how much force is needed to move the rock?

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

they aren't great and cause destruction, idk man