Hi there!
![\large\boxed{PE = 7.35 J, \text{ }v \approx 3.13 m/s}](https://img.qammunity.org/2022/formulas/physics/college/ggxf9rrd1yw54lh56fccfqnoj2dyo9dkk8.png)
To find the potential energy of the ball at B, we can use the equation:
PE = mgh
Plug the given gravity, mass, and height:
PE = (1.5)(0.5)(9.8) = 7.35 J
At A, all of this potential energy is changed to kinetic energy, so we can use the following equation:
v = √2KE/m
Plug in the solved for energy and mass:
v = √2(7.35)/1.5
Solve:
v ≈ 3.13 m/s