Answer

a) i) 40kg x g = 400N (1)

ii) The child pulls the Earth (1)

b) i) 400N x cos 66 (1) = 163N (1)

ii) a = F / m (1) = 73 N / 40 kg (1) = 1.8 m s^-2(1)

c) Use v2 = u2 + 2as (1) v2 = 2 x 1.8 m s^-2 x 5.5 m = 19.8 m²s² (1) v = 4.4 m s^-1 (1)