```
Work = Force x Displacement in the direction of the force
```
In this case, the force required to lift the object is its weight, which is given by:
```
Force = mass x gravity
```
Substituting the given values, we get:
```
Force = 50kg x 9.8 m/s² = 490 N
```
The displacement in the direction of the force is the height lifted, which is 5m.
Therefore, the work done in lifting the object is:
```
Work = 490 N x 5m = 2450 J
```
Hence, the work done in lifting the 50kg object to a height of 5m is 2450 J.
