```
v = u + a*t
```
where:
* v is the final velocity (in meters per second)
* u is the initial velocity (in meters per second)
* a is the acceleration due to gravity (in meters per second squared)
* t is the time (in seconds)
In this case, the initial velocity (u) is 0 meters per second, since the object is dropped from rest. The acceleration due to gravity (a) is approximately 9.8 meters per second squared. The time (t) is 2 seconds.
So, plugging these values into the equation, we get:
```
v = 0 + 9.8 * 2
```
```
v = 19.6 meters per second
```
Therefore, the change in velocity for the 10 gram object is 19.6 meters per second.
