How far should pencil held from a convex mirror of radius 80 cm to form an image one-half the size of the pencil?

What is the final velocity of the initial velocity of 25 and -50?

Asap i'm in class rn a 1,000-kg car is traveling 20 m/s on a flat stretch of road. it gets to a hill and coasts uphill until it stops. how high up the hill does the car travel? givens: equation: 1/2mv2initial=mghfinal solve for h. plug & chug, label.

If a simple machine reduces the strength of a force, what must be increased?