Use mechanical energy conservation
[Ek + Ep] at lower point = [Ek + Ep] at higher point
Ek at lower point = Ek at higher point + Ep at higher point - Ep at lower point
Ek at lower point = 1/2 m v^2
Ek at higher point = 0
Ep at higher point - Ep at lower point = mg(1.80m -0.60m)
1/2 mv^2 = mg (1.20m)
v^2 = 2g(1.20m)
use g = 10m/s^2
v = √[(2)(10m/s^2)(1.20m)] = 4.90 m/s^2
