How to find speed of an object

Can someone explain the normal force? where does it come from? ... ?

Your car is traveling behind a jeep. Both are moving at the same speed, so the velocity of the jeep relative to you is zero. A spare tire is strapped to the back of the jeep. Suddenly the strap breaks, and the tire falls off the jeep.

A moving freight car collides with an identical one that is at rest what happen to the second car after the collison

A 4.9 A current is set up in a circuit for 5.4 min by a rechargeable battery with a 6.0 V emf. By how much is the chemical energy of the battery reduced?

In the context of depth perception, which of the following is a monocular cue? (A) Vivid colors (B) Disparity (C) Convergence (D) Texture gradient

In a reaction with water, a base will accept a proton from the water; therefore, the water must be acting as an acid. True or False

What are the three properties of gravity

How do matter and energy interact?

What is something that has a lot of thermal energy?

Why do we use a shunt on the galvanometer