1. solution:

There is a balance condition of lever balance:

F* 1.5M=600N*0.5M

F=200N A: The support of ground opponents is 200N. ..

2. Solution:

1 min = 60 seconds

50 cm = 0.5 m

By W=FS:

W=0.5M*200N

= 100J

100J*30=3000J A: The work done is 3000J.

From P=W/t:

= 3000/60s

=50W A: Power 50W.

It should be like this. LZ should be adopted.