Answer

a) Energy = 1/2fx = 1/2 x 25 N x 0.15 m (1) = 1.875 J (1)

b) i) 1/2mv2 = 1.875 J (1) v2 = 2 x 1.875 J / 0.020 kg = 187.5 m2s2 (1) v = 13.7 m s-1(1)

ii) mgΔh = 1.875 J (1) Δh = 1.875 J / 0.02 N (1) = 9.4 m (1)