Where is the ranking of bitcoin trading platform

1. There are about 30 bitcoin trading platforms in China. The most famous is "3 fake platforms". Bitcoin, China, OK, fire coin. This "three fake platforms" and foreign bitcoin price difference can get 1000 gap! Limit the withdrawal of money and do the arbitrage work by yourself! If you want to invest, you can find a platform that can withdraw money. At least what you have is real bitcoin.

2. If you don't know anything, you can ask me.

3. Solution: the pulling force is 1000N.
because it is lifting at a constant speed, the object is affected by the balance force. The pulling force and gravity are a pair of balance forces, f = g = 1000N.

don't you seek work?

4. According to the theme, the work done by gravity is equal to that done by escalator:
the kinetic energy at the beginning and end is 0.
W + 0 = MGH + 0
W = 500 * 4 * 10 = 20000j