I love those tasks, where is needed destroy something. In this case, I cannot make a mistake. And thats also the point of this game Hammer 2: Reloaded.
What is needed destroy is always visible at the left part of the screen. As a tool for achieve the goal you can use anything - own weapons, parked cars or calmly free-available tank. Can you destroy all desired things at all 30 levels which this awesome game offers?
Have fun.