Answer:
8 7J
Step-by-step explanation:
work done= force in the direction of displacement × displacement
so, work done= 2.9 × 3
= 8.7J
we used force as 2.9, because 2.9 is the weight of the block (force that acts vertically downwards), so to lift the block, we would need to exert an equal force (2.9N) in the upward direction.