Distance for which the balloon has been pulled by the child = 12 meter Force applied by the child to pull the balloon = 1.0 Newton The angle below horizontal = 60 degree These information's are already given in the question. Based on the above information's the answer to the question can be easily determined. We know that Work done = Force * Distance * Cos(60) = 1 * 12 * (1/2) = 1 * 6 = 6 Joules So the work done by the child is 6 joules. I hope the procedure is clear enough for you to understand. Based on the above mentioned procedure, you can always solve problems of similar kind without taking any outside help.
