1. X lifts a 500g mug of beer to a height of 0.5 m. How much work does X do?

2. Y lifts a 1 kg mug to a height of 2.5m in 5 seconds. How much work does Y do?

3. Ship = 4 500 tonnes, engine provides thrust force of 90 000N. What is teh shortest time in which teh ship can accelerate from 10-28 kms/hr?

I don't really get the method and formula we have to use to get this. Thanks to whoever works this out in advance =D.