Question

A. If I did 200 Joules of work on a box to liftit a distance o f5m at constant speed, how much did the box weigh?

B.Does it require more work to raise a blockwith a mass of 15 kg by 4 m, or to raise a 20 kg block by 2 m, if both are moving at a constant velocity? Prove your answer.

Answer 1

See below

Step-by-step explanation:

A)

W = f x d

200 = f x 5

f = 40 N mass = 40 / 9.81 = 4.1 kg

B) first one work = 15 (9.81) *4 = 588.6 j ( REMEMBER : F = ma)

second one work = 20 (9.81) * 2 = 392.4 j