Imagine that you pushed a box, applying a force of 30 newtons, over a distance of 5 meters. How much would you have done?

15 joules

35 joules

65 joules

150 joules

Work done by a body to the system is the product of the force applied and the distance to which the system moved. The distance must be in the same direction as the force. In the given above, the force applied is 30 N and the distance is 5 meters. Multiplying the two gives an answer of 150 Nm. Hence, the answer is 150 joules.