After a $100 million dollar opening weekend Iron Man's momentum is still going strong as it dominates the box office for a second week.The action film that stars Robert Downey Jr grossed over $50 million, more than $30 million more than the film at number two.The Wachowski brothers, who are best known for the Matrix franchise return with Speed Racer, an anime inspired movie starring Emile Hirsch and Christina Ricci.However with a critical mauling the film has struggled at the box office grossing just over $20 million and may struggle recouping is $120 million budget.What Happens in Vegas, comedy starring Cameron Diaz and Ashton Kutcher, rounded off the top three grossing $20 million.The only other new entry in the top ten was David Mamet's Redbelt which jumped thirty one places from forty one to ten.1. Iron Man - $50.5 million

2. Speed Racer - $20.2 million

3. What Happens in Vegas - £20 million

4. Made of Honour - $7.6 million

5. Baby Mama - $5.8 million

6. Forgetting Sarah Marshall - $3.8 million

7. Harold and Kumar Escape from Guantanamo Bay - $3.2 million

8. The Forbidden Kingdom - $1.9 million

9. Nim's Island - $1.3 million

10. Redbelt - $1.1 million FemaleFirst Helen Earnshaw

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