Answer:
a). 
b). 
Explanation:
For the block that stays on the track, its maximal height is attained when all of the kinetic energy is converted to potential energy
a).
The height for the block on the longer track can by find using this equation:

Cancel the mass as a factor in each element in the equation



b).
The other lost some kinetic energy so, use a projectile motion to determine the total height for the other bock:




Solve to v'





Can a measurement be exact? No
Golf ball because it weighs less so it has more power to yeah
Haven't done one like this in awhile but I see no one is answering so I gave it a try. I think it's right but let me know if you see something fishy...