1. An out of control train is running down the track at 35 m/s. If the conductor sees a car on the tracks 200 meters front of him. what is the negative acceleration needed to stop and save the car being hit?

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.

What is an aquifer for science class

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.