if the ball starts with a speed of 4.0 m/a and slows at a constant rate of -0.50 m/s2, what is its velocity after 3.0 m/s

Asample of a gaseous substance changes into a liquid

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.