Final answer:
The work done on the flower pot when it is lifted 0.8 m off the floor using a constant force of 20 N is 16 J (joules), answer option (b).
Step-by-step explanation:
The question involves calculating the work done by a force when lifting an object vertically. Work done (W) is given by the formula W = force (F) × distance (d), provided that the force is in the same direction as the movement. In this case, the force exerted by Rashid is 20 N, and the distance the flower pot is lifted is 0.8 m. By multiplying the force by the distance, we find the work done: W = 20 N × 0.8 m = 16 J. Hence, the correct answer is (b) 16 J (joules).