A helical compression spring is made out of 5mm diameter music wire with a modulus of rigidity of 70 GPa and 16 active coils. What should the diameter of the coils be to have a spring rate of 8 N/m

what are the options.

explanation:

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

a straight line sloped