Please need your help asap !!! An arcade machine uses a spring to push a metal ball.
(a) How is energy stored in a spring when it is compressed?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers