Mass of 25 kg weight is 25/9.81 slug of mass.
The (more) speed an object has, the (lower) the potential energy and the (higher) the kinetic energy. (I believe that is correct but it’s been a while since I’ve done this)
The momentum of two or more objects during collisions is not lost nor gained
Answer with Explanation:
We are given that


a.We have to find the torque on the particle about the origin.
We know that
Torque=
By using the formula

b.



Substitute the values then we get



Because 

It 45 because it has to be this and that and ur gay