Prove that the rms value of an alternating triangular wave is given by /√ where E is the amplitude of the wave​

Not what goes around on earth but the universe too.

//(b) both involve the use of levers;

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.