# The body

The body slides down an inclined plane, forming an angle α = π / 4 = 45° under the action of a horizontal plane under the effect of friction forces with acceleration a = 2.4 m/s

^{2}. At what angle β must the plane be inclined so that the body slides on it after a small push at a constant speed?### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**planimetrics**- right triangle
- triangle
**goniometry and trigonometry**- sine
- tangent
- arctangent
- arcsine

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