Final answer:
To calculate the work done to lift a 4 N block a distance of 3 m, use the work formula W = Fd. The work done is 12 Joules since W = 4 N * 3 m.
Step-by-step explanation:
To calculate the work needed to lift a block weighing 4 N a distance of 3 m, you can use the formula for work done against gravity, which is W = Fd, where W is the work done, F is the force applied, and d is the distance moved. Since the force needed to lift the object is equal to its weight and the block is lifted vertically, we can set F to 4 N (the weight of the block) and d to 3 m (the distance lifted).
The calculation would then be:
W = Fd
W = 4 N * 3 m
W = 12 J
Therefore, the work done to lift the block is 12 Joules.