Originally Posted by

**Juggalomike** This question is killing me, i believe it is solved with triangles(which is why im posting it in the geometry forum) because every method i have tried has failed.

The speed of a 2.5 kg block sliding directly down a frictionless inclined plane is found to be 1.70 m/s. At 1.51 seconds later it has a velocity of 5.72 m/s. Calculate the angle of the plane with respect to the horizontal (in degrees).

I was thinking that the vertical axis would be 9.8 for gravity so i could simply do ((5.72-1.70)/1.51)/9.8 to get the % of 9.8 that the acceleration is, then multiply 90 degrees by that, the angle seems as if it would work but im getting the wrong answer, anyone else have any idea?