Solution of task 13.3.7 from the collection of Kepe OE

Solution of task 13.3.7 from the collection of Kepe OE

13.3.7
A material point of mass m = 5 kg moves along a curvilinear trajectory under the action of a force, the projection of which onto the tangent F? = 7H, to the normal Fn = 0.1t2. Determine the modulus of acceleration of the point at time t = 12 s. (Answer 3.20)