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**1. Homework Statement**

The velocity of a 2.10 kg block sliding down a frictionless inclined plane is found to be 1.13 m/s. 1.00 s later, it has a velocity of 4.13 m/s. What is the angle of the plane with respect to the horizontal?

**2. The attempt at a solution**

I drew a diagram and everything...but I have never had to solve for an angle so I am not sure what formula to even start with.