1.) if you are sitting still are you accelerating? how do you know? 2.) you’re on a skateboard, moving very fast but at a constant speed. are you accelerating? 3.) lara claims that if an object is accelerating it must be moving. she also claims that if an object is not accelerating it must be at rest. is she correct? if not, what would you say to prove her wrong?

The dot diagram represents the motion of the motorcycle as it moves from left to right

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.