Un mobil pleacă dintr-un punct cu viteza de 5m/s. După 30s, din acelaşi punct pleacă în urmărirea primului un al doilea mobil cu viteza de 8m/s. La ce distanţă de punctul de plecare îl ajunge al doilea din urmă pe primul.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)