Solution of task 13.3.6 from the collection of Kepe OE

Solution of task 13.3.6 from the collection of Kepe OE

13.3.6
The material point moves along a curvilinear trajectory under the action of a force, the tangential component of which is F? = 0.2t2, and the normal component Fn = 8H. Determine the mass of the point if, at time t = 10 s, its acceleration is a = 0.7 m / s2. (Answer 30.8)