Определение скорости и ускорения точки по заданным уравнениям ее движения решить , писал препод.

1. invention2. arrival3. improvement4. publication5. explanation6. trainer 1. to believe - to be certain that smth is truebelief - confidence that smth is true 2. to depart - to leave a placea departure - a plane, a train leaving a place at a particular time 3. to perform - to act in a play, to play a piece of music, to entertain an audience a perfomance - some kind of entertainment: a play, a concert