Given a particle that has the acceleration a(t) = 4e3 meters, a. find the displacement at 2 seconds, assuming an initial position of o & from rest. b. find velocity at 1 second assuming starting from rest.

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?