1. The problem statement, all variables and given/known data A 100 newton force lifts a 5 kilogram object 2 metres. When the force is removed, the object continues to move upwards. Calculate: (a) the work done by the force; (b) the gain in gravitational potential energy (using g = 9.5n/kg); (c) the gain in kinetic energy. 2. Relevant equations Ep = mgh Ek = 0.5 * m * v^2 W = F * d F * d = 0.5 * m * v^2 F*d = mgh (lifted upwards) 3. The attempt at a solution a) F * d = 200J (correct) b) Ep = 5kg * 9.8N/kg * 2 = 98J (correct) c) Need to find the velocity: (sqrt(2*(f*d)/m)) = 4(sqrt5) v = 4(sqrt5) so: 0.5 * 5 * (4(sqrt5))^2 = 200J which is wrong, the correct answer is 102 J Where did i go wrong?