From a height of 20 meters, a stone is thrown downwards at 15 m/s. What is the velocity just as it hits the ground?

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

How to tell if a molecule is polar or nonpolar with electronegativity