Question

Which requires more work: lifting a 10 kg sack of rice to a

vertical distance of 2.0 m or lifting a 5 kg sack of rice to a

vertical distance of 4.0 m?​

Answer 1

Answer:

lifting a 10 kg sack of rice to a vertical distance of 2m requires more work

Step-by-step explanation:

work done = Force/distance

work done for lifting the 10 kg sack =F/d= mg/2 = 10kg×9.8m/s ÷2m = 49 J/s

work done for lifting the 5 kg sack = F/d= mg/2 = 5kg×9.8m/s ÷4m = 12.25 J/s

49>12.25

Answer 2

Given:

According to the question first solve for it

For lifting a 10 sack of rice to a vertical distance of 2.0 :

W= Fh = mgh

mgh = 10 × 9.8 ×2

=196 J

For lifting a 5 sack of rice to a vertical distance of 4.0 m:

mgh = 5 × 9.8 ×4

=196 J

here we see that from the calculations, both cases require the same amount of work.

Hence the answer is both cases require the same amount