Discover Questions

A position given by:
r = [2.0m+(5.0m/s)t] i + [3.0-(1.0m/s^2)t^2] j,
What is the magnititude of the acceleration of the object at time t=2s? Most rock forminh minerals have a specific gravity of between 4 and 5? What about my order? Is universe or are universes? Find three consecutive integers such that the product of the first two is 20 less than the product of the last two?