Уравнение движения материальной точки имеет вид: x=2-4t+t2.Определить импульс и кинетическую энергию точки массой 1 кг через 2 секунды после начала отсчета времени.
The impulse of a particle is the product of its mass and velocity, so we need to first find the velocity at t=2 seconds. Differentiating the equation of motion, we get v= -4+2t. Plugging in t=2, we get v=0. Now, the kinetic energy of a particle is given by the formula K=(mv^2)/2. Substituting m=1kg and v=0, we get K=0. Therefore, at t=2 seconds, the impulse is 0 and the kinetic energy is 0.
