PART A)
Here by force balance along Y direction

Force balance along X direction

now by torque balance



PART B)
now from above equations



now net reaction force of wall is given as


Yes it is work because when you throw a ball, you transfer energy to it and it moves.
Gold or copper than silver
Sprains/Strains, tears to muscles, tendons ligaments, not hypothermia bc thats when you get really cold and not dehydrated
It will be
d=m/v
=10/2
=5g/ml